1977 suzuki gs400

[whit79]

I am have front brake trouble with my 1977 gs400 . The piston does not fully return and is pushing the brake pads in one area against the plate.
How do I fix this problem
Darrell

[Nessism]

The caliper is corroded on the inside. Take the caliper apart by pushing out the piston (compressed air applied at the inlet works well). If the piston is free from pitting, you can just replace the seals, if the piston is damaged, you will need a complete rebuild kit.


I have a freshly rebuilt caliper (seals and piston) from a '81 GS450. PM me if interested - I'll sell for the cost of the rebuild kit.

Edit: Just checked Bike Bandit and it seems the 77 caliper is different from the 81 so I'm not sure my caliper would fit.

Good luck.

[spots25]

it ought to fit. I put a caliper off a '83 GS550 on my '78 GS400

[ptm]

I am have front brake trouble with my 1977 gs400 . The piston does not fully return and is pushing the brake pads in one area against the plate.
How do I fix this problem
Darrell

Like nessism said, you need to rebuild the caliper. It's fairly straightforward to do and all the parts are available. In addition to replacing the piston boot and seal, and cleaning the piston and cylinder, be sure to clean and lube the pins that the caliper slides on. They allow both pads to push on the rotor. If it doesn't slide well it will cause the pads to wear unevenly.