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Discussion Starter · #1 ·
How do i diagnose a faulty master cylinder? I've recently put new pads on the back and blead the system (with a helper) but the pedal is still very spongy.

With the engine off I can pump up the pressure and it holds.

Start the engine and the pedal goes to the floor.

Pumping the pedal with the engine on builds up some pressure but the pedal still goes to the floor.

Anyone any ideas?

Rob
 

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Discussion Starter · #2 ·
Just had a search round for answers and I could have a stuck Caliper. Think I'm gonna clamp the hoses on each wheel tomorrow and see if that stiffens it up. Good idea?

Rob
 
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