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MG MGB Technical - New seals, no brakes!

Fitted new calliper seals. Replaced callipers. Bled brakes.
No front brakes at all!
Pumpy-pumpy-pumpy-pump, some brakes.

Bled again.

Looking at the front brakes, there is a 15 thou' gap between piston and pad. The new seals are pulling the pistons back well clear of the pads, and the pedal travel is all used up moving them back out again.

My solution: remove pads, press pedal to push piston out too far, then force pads into place. Result, solid pedal.

Don't know if the brakes work though, will post if they do!
Martin Layton

I've never had a problem like that.

Did you lubricate the seals and pistons with brake fluid during assembly?

Dave
D O'Neill

Ignore the last question...I've just read your other thread!

Dave
D O'Neill

Everytime I replace the caliper seals I "massage"
the pistons in & out of the caliper (but not all of the
way out!) by pressing on the brake pedal and then
pushing the pistons back in several times

This reassures me that the new rubber seals are seated and are sitting square in their grooves.
Daniel Wong

Hi Dave, I'm back.

They work, but seem to pull a bit to the left. Not surprising as the left wheel was stiffer to turn than the right. (the left brake is likely coming on first whilst the right pistons are taking up clearance.)

Hopefully they will settle down now they are full of fluid and I'm using them.

I've had this on motorbikes before. Normally you just wire tie the lever back to the bar over night and the seals get the right idea.
Martin Layton

Thanks for the suggestion Daniel, I might give that a try tomorrow. I'm hoping that things will settle down overnight.
Martin Layton

This thread was discussed on 05/04/2007

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