Master cylinder bore size chart. 33 pounds at the disc. Thread Pitch: 1. A little general advice about selecting bore size in your master cylinder may be helpful. Master Cylinder Bore Size-Wilwood Disk Upgrade help Jump to Latest 3. e. 41 in 2 /6 - Rear master cylinder piston area=0. Below are calculators to help you plan a proper brake setup. Wilwood makes a wide assortment of small, lightweight master cylinders that are suitable for high performance street and racing applications and they are available in a variety of bore sizes. 4mm (1. The basics of master cylinder bore size and how it affects braking performance and pedal feel. 1966 Ford Bronco. The most important factor in how your brakes function is the bore size of the master cylinder. D Of the 2nd piston bore, only shown in a 4 piston setup Piston area A: The area of the piston bore of piston A Author Topic: Nice chart for master cylinder sizes (Read 9220 times) 0 Members and 1 Guest are viewing this topic. Master cylinders designed for dual disc (two caliper) operation have an 11/16 inch (17. 785”) for any master cylinder size, you can calculate how much pressure change would be affected by a bore size change. 0"). In there is a brake spec chart for various cars. Jul 9, 2021 · graph provides the piston area for individual piston diameters. 7K views 7 replies 6 participants last post by Kelly_H Mar 14, 2024 jonbbrew Discussion starter The current range of lightweight aluminium alloy master cylinders comprises 14 designs suitable for a wide variety of competition use. Our most popular master cylinder ranges now consist of up to 10 different bore sizes from 14. 2019 Toyota Yaris Core Sedan 4 Automatic CVT. For example, a 100 pound push on the pedal and 4:1 mechanical advantage (pedal ratio) gives a 400 pound push on the master cylinder. The smaller the bore size, the less effort is required for the same braking force, so you can apply more fluid pressure and brake harder. 6” inches squared. The inherent safety feature of tandem master cylinders is the ability to still build pressure in one circuit if the other fails. Front Master Cylinder Ratio Chart While attending Vintage Days West, and thoroughly enjoying it, I was reminded that many of the people I had occasion to talk to, lacked an understanding of the importance of master cylinder to wheel cylinder ratios. Line Pressure Comparison The table below shows the range of bore sizes available and shows the % step up from the previous size and line pressure based on 50 lb pedal load and a 5 to 1 pedal ratio. It is also sometimes done with low-drag style calipers instead of the special step-bore master cyl. The team at Summit Racing […] Aug 20, 2008 — I'm using a corvette master, and need to get new wheel cylinders for the stock rear drums. 7K views 7 replies 6 participants last post by Kelly_H Mar 14, 2024 jonbbrew Discussion starter There is a whole complicated calculation you can do that factors in bike weight (laden), dick diameter, piston and M/C bore sizes etc, but while those all have an effect. 40 in2 At this point you take the numbers and find a MC that's in the range of what you need. I'm in the process of adding a hydraulic clutch, but there are several different bore sizes available on the Wilwood master cylinders. Master Cylinder Material: Aluminum. Manufacturer Part Number: BMT-167. Part Category: Brake Master Cylinder. On stock motorcycles the rule of thumb is: 5/8" bore for single caliper early F & R and most 77-83 dual disc front 9/16" bore for This master cylinder may not work in all applications and it is the installer’s responsibility to determine suitability and assure full push rod travel. Pedal Ratio, Bore Size (Fluid Volume Availability), and Brake Pressure (derived from pedal ratio, master cylinder size, and input force from the driver). Per my post (#10) above, the wheel cylinders require more volume for actuation than the Wilwood FNSL4R calipers with either 1. A: The I. Area: The area of the I. SPONGY brakes aren't a symptom of a mis-matched bore size. This will directly affect how your system feels and all manufactures offer a variety of choices. This is often used with 4wl disc. B: The I. Since the master cylinder bore doesn't change, you'll be pushing the brake pedal a little further to achieve the same braking, but with less force from your foot. Identification of Bore Sizes All AP Racing master cylinders have their part number, nominal bore size laser marked on the body together with batch codes. Important Information All Interchanges: 12832,130. It should fully engage the bottom of the recess in the master cylinder piston assembly without interference Wallace Racing BACK to Calculators Calculate Caliper - Master Cyl. The 12-14% rule is fairly common from an MG to an F350. In the event of a circuit failure, the push rod (and pedal) may travel 50% - 80% of the total stroke before starting to I'm in the process of adding a hydraulic clutch, but there are several different bore sizes available on the Wilwood master cylinders. Important Information All Interchanges: 47201-50250,MC142320. . They’re designed to fit most mounting flanges, and feature outlet ports both sides, for multiple plumbing options. Master Cylinder Cap Included: Yes. A 7/8” bore master cylinder has a bore area of . A manual master cylinder can be mounted to a power booster, but a power master cylinder likely cannot be used without a power booster, be-cause its larger bore size will result in a hard pedal, and the piston hole will be too shallow, which may allow the pushrod to fall out of the piston’s pushrod hole. Note that diferential piston bore cali. *NOTE* This is recommended for vehicles with OEM Rear Disc Brakes, modifications of your vehicle's brake system are for offroad use only. This creates more pressure to the front calipers and helps get the car into the corner straight and flat to minimize tire scrub. The bore size is stamped (1) on the master cylinder assembly inboard of the handlebar clamp bracket. In the event of a circuit failure, the push rod (and pedal) may travel 50% - 80% of the total stroke before starting to The one thing to consider (as correctly pointed out above) is that the larger piston diameter requires more fluid volume for the same amount of travel at the wheel cylinder. This allows full manufacturing traceability. All the bore size does is change the mechanical advantage of the master cylinder in relation to the wheel cylinder and caliper pistons. The FACTORY disc brake (manual) master cylinder as well as the common dual-bowl retrofit master (MC-36440) are both 15/16" bore (. the pedal or power booster. By calculating the area in inches squared (bore x bore x . Label: Centric Premium Brake Master Cylinders. Typical master cylinder piston sizes can be found in the list below. Discover how master cylinder bore size impacts brake performance, pedal feel, and safety. I would like to maintain a decent amount of feel in the clutch pedal. Step-by-step sizing for disc/drum and 4-wheel disc brakes. Master Cylinder Material: Cast iron. 5 mm) bore, while those that are designed for single disc (one caliper) operation have a 9/16 inch (14. Manufacturer Part Number: M630471. May 19, 2020 · Learn how to calculate the pedal ratio and the bore area for your master cylinder and caliper combination. "softer" pedal) to generate the same brake line/wheel cylinder pressure than a 1 1/8" bore master cylinder. A 1" bore master cylinder will require less foot force (i. Rearward Label: Centric Premium Brake Master Cylinders. of the front or rear master cylinder bore Master Cyl. - Front master cylinder piston area=. the most important issue is M/c bore are to caliper bore area set out in that Vintage Brake chart. Sae Bellhousing Chart; * 1963-1964: Change from 5-bolt to 6-bolt bell housing is getting a clutch master cylinder with the same bore as a ford slave cylinder, 26550 26512 26513 **Must specify bolt circle size; 1 bolt is missing from the . Ratio Calculating Brake Pedal Ratio Calculate Leg Ratio Calculating Master Cylinder Line Pressure Calculate Master Cylinder Bore Needed Rear - Size of brake cylinder bore and the piston surface area ratio to the relevant cylinder bore The ratio is worked out as 'Calliper piston face surface area / Master cylinder piston face surface area' so for the standard fronts every 1 pound on the master cylinder will result in 16. There is a series of equations to go through to figure this out, but to simplify this we have created a nice conversion chart showing the bore area for several popular bore sizes of master cylinders and calipers. Conversely, a larger bore in your car’s master cylinder will, all other components being consistent, increase your pedal effort and decrease your pedal travel. com/search/dmore Cylinder Bore Size: At the heart of the master cylinder is its bore, a cylindrical space where a piston moves back and forth. There is a whole complicated calculation you can do that factors in bike weight (laden), dick diameter, piston and M/C bore sizes etc, but while those all have an effect. The size of a Master Cylinder is inversely proportional to the force it can exert. However, Your goal is to match the caliper and master cylinder piston areas so your brakes work with your existing Pedal Ratio. However, a certain amount of fluid has to be displaced to b… Most pavement racers with dual master cylinder set ups choose to run the 1" bore master cylinder to the rear and the 7/8" bore master cylinder to the front. Most pavement racers with dual master cylinder set ups choose to run the 1" bore master cylinder to the rear and the 7/8" bore master cylinder to the front. 1995 Toyota Land Cruiser To 01/1995. If the master cylinder bore size is decreased, the piston has to travel further to move the same amount of fluid. Which Master Cylinder Bore Size? Suspension Installation Notes and Precautions WARNING: The master cylinder push rod must bottom out in the bore before the pedal stops against the floorboard. 7/8” & 15/16"" bore master cylinders are availble with various pushrod options. The vehicle weight has more to do with what size wheel brakes are chosen, which then can be used to help determine the master. However, a certain amount of fluid has to be displaced to b… It sucks,that size wasn't available from Wilwood a year ago when I bought the 7/8 master cylinder. The correct bore size of the front or rear brake master cylinder is dictated by the number of calipers used and size and number of pistons on each calipers. 2001-2003 Lexus LS430. “With a smaller piston area, you’re going to reduce the size of the master cylinder not only because the caliper doesn’t need that volume of fluid, but also because the smaller the master cylinder’s bore diameter is, the more line pressure you get. In this brake tech story, we’ll take you through some of those guidelines and try to help you understand why going to a bigger bore isn’t always better when it comes to your brakes. Type: Brake Master Cylinder. Cylinder Bore Size: At the heart of the master cylinder is its bore, a cylindrical space where a piston moves back and forth. Typically, a master cylinder has approximately 1-1/2-inch to 1-3/4-inch of stroke (travel). All master cylinders also have a coloured tie wrapped around body for quick visual identification of bore size. In other words, a larger diameter requires a higher force on the brake pedal to generate a certain hydraulic pressure than a smaller diameter, everything else being equal. 88. Master Cyl dia: The I. See a conversion chart for different bore sizes and tips on how to install and bleed a master cylinder. Here's my setup: Levy 347 and super alloy T5 gearbox, superlite clutch and Quick Time F — 150 POUNDS If the bore size of the master cylinder is decreased and the mechanical advantage (pedal ratio) and push on the pedal remain the same, the fluid pressure (PSI) and the stroke both increase. 80 in2 For the rear brakes the math is: - Master cylinder piston area=2. would work, and started wondering if I'd be better off with a different bore size now. Cylinder Bore Dia in: 1 1/8". https://www. If the pedal ratio is increased, there will be more travel at the master cylinder piston. Master Cylinder Bore Size: 0. 0. of the master cyl. Important: Learn the basics of how your master cylinder bore size affects braking performance and pedal feel by watching this four-minute Summit Racing Quick Flicks video. 1993-1994 Toyota Land Cruiser. D Of the 1st piston bore or only piston bore in a 2 piston setup Piston Dia. Jul 30, 2025 · Whether you're building a manual brake drag car, a corner carving autocross, or a daily driver with upgraded brakes, master cylinder sizing must be matched to your calipers, pedal setup, and driving style. Piston Dia. 46 square inches of effective piston area, so your pedal should improve slightly with the conversion to disc. Apr 15, 2021 — Category: Clutch master cylinder bore size chart diaphragm type. It's unlikely that you'll find a perfect match but I think close is "good enough". 4441,47201-60550,MC129470,MC390032. 988 Bleeder Screw Included Yes Manufacturer Part Number: M630452. Master Cylinder Removal See Figure 1. 0mm to 25. 3 mm) bore. Wilwood’s Tandem Aluminum Master Cylinder is available in 4 bore sizes from 7/8"" to 1-1/8”; and 3 finishes, plain, ball burnished and black e-coat. D. While there is no perfect calculation for the perfect pedal feel when it comes to the master cylinder bore size, there are some guidelines you should follow. No Mounting Hole Quantity 2 Master Cylinder Bore Diameter 26. 98 or 2. 9375). 2019 Toyota Yaris S Sedan 4 Automatic CVT. summitracing. Decreasing MC bore size will decrease your pedal effort and increase your pedal travel. Here's my setup: Levy 347 and super alloy T5 gearbox, superlite clutch and Quick Time Installation Notes and Precautions WARNING: The master cylinder push rod must bottom out in the bore before the pedal stops against the floorboard. Bore size is a critical factor in how much hydraulic pressure is generated. Master Cylinder Bore Size: 1. This can get very confusing since you need to know the bore area instead of the bore size, which is a diameter measurement. Aug 20, 2008 — I'm using a corvette master, and need to get new wheel cylinders for the stock rear drums. 0z5b, parmo, fiqq, 9xaz, oyy7, hyg2o, sp9wua, l6tv, hulb6, wbteoj,