Front calipers sticking

Cougar Community Classic Cougar Maintenance Restoration and Repair
1

I bought my 1968 base model 6 months ago, it has power front disc brakes and came with a new master cylinder and calipers. I replaced the rear brake cylinders and vacuum booster then bled the whole system and have always experienced front brake drag. I’ve been reading threads with others that had similar issues and have since then replaced the front flex hoses and brake distribution block.

After applying the brake pedal the discs are practically locked up until I open one of the bleeders and it releases. I’ve also loosened the master cylinder from the booster and the brakes are still locked up so it’s not the rod adjustment. I can’t figure out why the fluid stays under pressure after stepping on the brakes, anyone have any other ideas?

2

You might have either an incorrect master cylinder or it was mistakenly assembled with a residual pressure valve in the front brake port. Simple test is pump the brakes up and then crack the line for the front brakes at the master. If fluid squirts out and the brakes release, you’ve found your problem.

1 Like
3

The rod going from the booster to the master cylinder will cause this if it’s adjusted too long. There is also a failure mode of the booster that will cause this.

4

I agree with rod too long.loosen bolts or nuts holding master to booster

Insert 1/16 shim arornd studs between the master and booster the snug up nuts . Start car and check brakes