Problems bleeding brakes

[yellowmitch]

Hi there,

I have just fitted a brand new in box ATE master cylinder, new pipework and Bigg Redd rebuilt calipers all round to my 1972 saab 99

I fitted a professional pressure bleeder (like gunson eezi bleed but better) and easily got clean fluid coming out of every bleed nipple. All good so far then.

After removing the pressure bleeder I decided to pump up the pedal and bleed it the old way. I NEVER get a good pedal. It always goes to the floor and I only get a trickle of fluid out of each caliper after pumping up. I blamed the master cylinder so took it off and disassembled it. I can't find ANYTHING wrong with it.

Any ideas here?

Thanks

Alan

[matt of the vivas]

Wedge the pedal down overnight with a piece of wood and try it again the next day. You might find you get a load of air out that would not come out before.
Matt.

[davy67]

Hi Alan, I thinking of sending my Sprint calipers to Bigg Redd for reconditioning and polymer coating, just wondered if you would recomend them??

Regards

David

[Jon Tilson]

I'm not familiar with a 99 system but you must have trapped air somehow.

Look round the pipe runs. You may need to blank some bits off and get a solid pedal to that point.

Flexis are always a suspect.

Also if its a new master cylinder is there any chance the piston could be sticking up in the bore? that will give a floppy pedal and no
bleed effort. My 06 clutch master does this....very annoying.

Jonners

[Carledo]

Just a couple of thoughts, does your car have the front handbrake calipers, or is it drum in disc like the earliest cars? If it's not DID did you release the handbrake before bleeding?
And have you tried bleeding it with the engine running?
I know its not the same car, but some Volvos of the same period had a very wacky bleeding system whereby you had to open 3 bleedscrews simultaneously, then a different 3 and so on until all 4 possibilities had been covered..
I also find when replacing a dualcircuit master, that it pays to bleed the master first, just by gravity.

Steve