Front o/s brake

R

Reece87

New Member
So weve freed up the front pistons in the caliper so theyre nice and free, connected all pipes up. When i push the pedal the pistons come out but dont go back in. Would the only reason for this be collapsed flexi pipe? Or something a bit more involved? Cheers
 
The only thing that retracts the pistons is the seals, so they won't go all the way back in when you release the pedal. They only go back just enough to clear the disc. If you can't prise the pistons back it could be the flexi, but not otherwise.
 
Once ive pressed the pedal down the pistons come out and lock the pads onto the discs. But when i release the pedal they dont retract so theyre locked on and the wheel wont turn unless i open the bleed nipple.

Flexi problem then?
 
Reece87 said:
Once ive pressed the pedal down the pistons come out and lock the pads onto the discs. But when i release the pedal they dont retract so theyre locked on and the wheel wont turn unless i open the bleed nipple.

Flexi problem then?
Click to expand...

In that case I'd agree.
 
Just been told in passing that it might be the seals in the caliper which act as a spring for the pistons.

Anyway to test everything? cheers for all the advice so far.
 
So replaced the flexi, still locking up, replaced the old steel lines with new copper ones from the silver servo thing to the caliper and no joy.

Only way to get anything considered like brakes is to have the brake pipe going into the servo loosened so that when i dab the brakes the brakes engage and the piston retract. Downside is a nice little spray of fluid everytime i dab the brakes.

What else should i look at before getting a new master cylinder or servo or whatever else i may need?

Ta
 
Reece87 said:
What else should i look at before getting a new master cylinder or servo or whatever else i may need?
Click to expand...

If you've only got the problem with one brake then it won't be the master cylinder or servo, it can only be the flexible hose or the caliper, and as you've eliminated the hose (we hope) by replacing it, that only leaves the caliper.
 
Had same problem with my near side. Seems rust is the issue and acts as a gripping sleeve on piston. Hydraulic pressure enough to force onto disc but hold in their so can't rotate tyre by hand etc.
Removed pads...pushed out pistons part way ..the cleaned off rust. Used mix of brake fluid and thin oil to lube pistons.
Pushed back in with lever.. In out few times. Refit all. Works ok now. Likely you have dame issues.
 
You must log in or register to reply here.
Back
Top