The best rear master cylinder motorcycle replacement depends on the bike’s make, model, engine size, and mounting dimensions. The Hoypeyfiy unit is aimed at a broad range of Suzuki motorcycles, while the MAD HORNETS option names Kawasaki Ninja models. For small Chinese pit bikes and ATVs, consider the LOCOPOW cylinder or the WEIYINGSI replacement; choose the complete hydraulic assembly when the caliper and related brake parts also need replacement.
| Product | Best For | Key Check |
|---|---|---|
| Hoypeyfiy Rear Brake Master Cylinder | Listed Suzuki models | Confirm exact year and fitment |
| LOCOPOW Rear Brake Master Cylinder | Small Chinese ATVs and pit bikes | Check 10 mm banjo bolt and mounting holes |
| MAD HORNETS Ninja Cylinder | Listed Kawasaki Ninja models | Verify model and year |
| Rear Brake Assembly With Caliper | Small dirt and pit bikes needing an assembly | Check dimensions and included parts |
| WEIYINGSI Rear Master Cylinder | Chinese 110cc–140cc pit bikes | Bleed the system after installation |
Hoypeyfiy Suzuki Rear Brake Master Cylinder
Best for: Owners of the Suzuki models named in the product listing. Its stated fitment includes GSXR 600, 750, 1000, and 1100; GSX1300R Hayabusa; SV650 and SV1000; RF600 and RF900; and several Bandit GSF sizes.
This option was selected because its listed model range covers multiple Suzuki sport, touring, and standard motorcycles. Use the model list as a starting point, not as a substitute for checking the exact year, mounting points, and connections. The supplied product information does not specify individual model years or detailed dimensions, so confirm fit before ordering.
LOCOPOW Cylinder for Small ATVs and Pit Bikes
Best for: Owners of many Chinese 50cc, 70cc, 90cc, 110cc, or 125cc ATVs, dirt bikes, pit bikes, and quads. The listing names Taotao, BMS, Roketa, Xpro, Apollo, SSR, Pitster, Piranha, Sunl, NST, and Kazuma applications.
The stated banjo bolt size is 0.4 inches (10 mm), and the product says it fits bikes that meet the mounting-hole size. That measurement makes this a more specific choice than a generic small-bike cylinder. It was selected for buyers who can compare hardware dimensions against their original part. Avoid choosing it by engine size or brand name alone: verify the mounting holes and banjo connection.
MAD HORNETS Rear Cylinder for Kawasaki Ninja
Best for: Riders seeking a replacement cylinder for a listed Kawasaki Ninja ZX6, ZX7, ZX6R, ZX6RR, or ZX7R from 1989–2014. The listing describes a new pump kit made from metal and plastic, in black, and says it is designed for easy installation.
This product is included because its fitment description identifies a specific Ninja family and year range. Match the motorcycle’s exact model and year to the listing before purchase; model names that look similar may not share the same brake component. The listing does not provide detailed dimensions or identify all included kit pieces, so confirm those details if the existing hardware also needs replacement.
Rear Hydraulic Brake Assembly With Caliper
Best for: Owners of listed small dirt and pit bikes who need a broader rear hydraulic brake assembly rather than a master cylinder alone. The stated applications include 50cc, 70cc, 110cc, and 125cc parts for SSR, KLX, BBR, CRF, TTR, SDG, and other named platforms.
The listing describes a master cylinder and caliper with a replacement disc brake kit, adjustable bolt spacing, and necessary components for installation. Adjustable spacing may help align the assembly with a particular pit-bike layout, but it does not guarantee fit. Check the dimensions and included components against the bike before ordering; this is not the most targeted choice if only the master cylinder is needed.
WEIYINGSI Master Cylinder With Built-In Reservoir
Best for: Owners of many Chinese 110cc, 125cc, and 140cc dirt or pit bikes looking for a replacement master cylinder with a built-in reservoir. The listing identifies it as an aftermarket replacement.
This option was selected for its stated displacement range and integrated reservoir. The listing specifically instructs buyers to bleed remaining air from the brake system after installation. It does not name detailed dimensions or individual bike models, so compare the original cylinder’s mounting and hydraulic connections before purchase. It may not suit a bike outside the stated range or one requiring a different configuration.
Buying Guide: How to Choose a Rear Master Cylinder
Does the part match your exact motorcycle?
Start with the motorcycle’s make, model, and year, then compare those details with the product’s stated fitment. Engine displacement alone is not enough to establish compatibility. The Suzuki and Kawasaki options list specific model families, while the small-bike cylinders describe broader applications that still require measurement checks.
Which dimensions should you check?
Compare mounting-hole spacing, the banjo bolt size, connection orientation, and the shape of the replacement part with the original cylinder. The LOCOPOW listing specifies a 10 mm banjo bolt and calls out mounting-hole size. For products without dimensions, consult the seller’s fitment information or compare the component directly before buying.
Do you need a cylinder or a complete assembly?
Choose a master cylinder replacement when the rest of the rear brake hardware is serviceable and the replacement matches the original. Choose a cylinder-and-caliper assembly when the listing’s broader components fit the repair need. Check exactly what the package includes rather than assuming hoses, brackets, or other parts are supplied.
What should happen after installation?
Hydraulic brakes require correct assembly and removal of air from the system. The WEIYINGSI listing explicitly says to bleed remaining air after installation. Follow the motorcycle’s service procedure and inspect the brake system for leaks and proper operation before riding. If you are unsure about brake work, have a qualified motorcycle technician perform or inspect the repair.
Frequently Asked Questions
Can I choose a rear master cylinder by engine size alone?
No. Engine size is only one clue. Confirm the motorcycle’s model, year, mounting dimensions, and hydraulic connections.
Are these products universal motorcycle parts?
No universal fit is established by the supplied listings. Each product describes particular models, engine-size ranges, or mounting requirements.
What is a banjo bolt size?
It is the stated diameter for the hydraulic fitting connection. The LOCOPOW listing specifies 10 mm; check that size against the brake line and original component.
Do I need to bleed the rear brake after replacement?
Air may enter a hydraulic brake system during service. The WEIYINGSI listing instructs users to bleed remaining air after installation; follow the motorcycle’s service instructions.
Should I replace the caliper at the same time?
Not necessarily. A cylinder-only replacement may be appropriate if the caliper is serviceable and the parts match. A complete assembly is an option when the caliper and related components are also part of the repair.