The brake caliper holds the pads and squeezes them onto the disc when you pull the lever. A seized piston, leak, or cracked body turns a safety-critical system into a hazard. This guide shows you how to choose and fit the right caliper.
1. Match the mounting and disc size
Caliper bolt spacing and the disc diameter it is designed for must match your fork or swingarm. A caliper from a different model will not align with the disc even if the bolts line up. Match the exact model and note the disc size.
2. Piston count and bore
The piston count (single, twin, or opposed) and bore set the clamping force. A mismatched caliper changes brake feel and balance front to rear. Buy the caliper specified for your bike.
3. Front vs rear, and ABS type
Front and rear calipers are not interchangeable, and ABS models often use a different caliper or banjo layout. Confirm the position (front or rear) and whether your bike is ABS or non-ABS.
4. Symptoms of a failing caliper
A spongy or soft lever, brake drag that heats the disc, a wheel that will not spin freely, fluid leaks around the piston or seals, uneven pad wear, and a bike that pulls to one side all point to a caliper fault. A seized piston or hardened seal is the usual cause.
5. Repair or replace
If the piston and bore are clean, a seal kit and fresh fluid can revive a caliper. If the piston is pitted, the bore is scored, or the body is cracked, replace the whole caliper – attempting to machine a safety part is not worth the risk.
6. Fitting tips
Clean the mounting faces, use new copper washers, and bleed the system properly until the lever is firm. Bed in new pads and disc gently, and check for leaks after the first ride.
Bottom line
Match the mounting, disc size, piston count, position, and ABS type, and replace worn seals or the whole caliper as needed. A firm lever and free wheel are your proof it is right.
Bike Model Fitment
| Bike Model | Year | Fits |
|---|---|---|
| TVS (Apache) | 2000-present | Yes |
| Royal Enfield (Bullet, Classic 350/500) | 2000-present | Yes |
| Hero (CBZ, CBZ Xtreme) | 2000-present | Yes |
| Bajaj (Pulsar series) | 2000-present | Yes |
| Honda (Unicorn, Shine disc models) | 2000-present | Yes |
Quick Mechanic Diagnostic Checklist
- Confirm front or rear caliper
- Match the caliper mounting bolt spacing
- Match the disc diameter it is designed for
- Confirm piston count and ABS vs non-ABS type
- Check for fluid leaks, drag, or a spongy lever
- Replace pads and bleed with fresh fluid
- Fit new copper washers and check for leaks
Frequently Asked Questions
How do I know if my brake caliper is bad?
A spongy lever, brake drag that heats the disc, a wheel that will not spin freely, fluid leaks, and uneven pad wear. A seized piston or hardened seal is the usual cause.
Can I repair a brake caliper or must I replace it?
If the piston and bore are clean, a seal kit and fresh fluid can restore it. If the piston is pitted, the bore scored, or the body cracked, replace the caliper - it is a safety part.
Are front and rear calipers interchangeable?
No. They differ in mounting, piston size and disc diameter, and they are not interchangeable front to rear.
Does ABS change which caliper I need?
Often yes. ABS models may use a different caliper or banjo layout, so match your bike ABS status and the exact model.
Are these brake calipers genuine OEM spec?
They are OEM-spec calipers made to the original mounting, piston size and disc match. The listing names the exact models covered.