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Post by petehodges on Mar 12, 2019 23:26:44 GMT 1
hi lads sorry i know its been asked to death
ive been though the search on the forum ,but i,m losing my mind with these fooking brakes
must of spent 1x day of man hours trying to bleed my rear brake (ap lockheed ) , ive done the lot back bleed , mityvac , syringe , i just cant get the pedal to firm up ,it grips the disc a little & thats it.
any ideas on this ? cheers guys
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Post by JonW on Mar 13, 2019 0:19:32 GMT 1
Two things to try:
- roll the caliper around slowly to ensure the air bubble is defo by the bleed nipple
and
- push the pedal down and wedge or tie it there and leave it overnight, that might help.
Ive had similar issues with the rear brake. you will get it, its just no fun sometimes.
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Post by pdxjim on Mar 13, 2019 0:35:02 GMT 1
Tie the pedal down overnight, and if that don't work, rebuild the master cylinder.
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Post by madmick on Mar 13, 2019 1:30:26 GMT 1
Adjust the pushrod so you are getting a full stroke from fully backed off to fully on, as the plunger might not be moving enough inside the master cylinder.
M.M.
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Post by dusty350 on Mar 13, 2019 8:14:34 GMT 1
Get the caliper higher than the master cylinder. You'll need to remove it from the carrier and tie it up as high as you can get it. Put a wedge between the discs and get the bleed nipple at the highest point. Good luck Dusty  |
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Post by earthman on Mar 13, 2019 8:22:57 GMT 1
Probably a long shot but what about the brake fluid itself, you using brand new from a sealed bottle?
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Post by midlifecrisisrd on Mar 13, 2019 9:01:07 GMT 1
Exactly as Dusty says
On the rear caliper the master cylinder is not usually the highest point so air stays there
The other thing I try before that is wrap some tissue around the cylinder banjo, press the brake and hold.
Then crack the banjo open just enough to let some fluid out and nip back up before letting the pedal go.
Steve
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Post by headcoats on Mar 13, 2019 9:11:26 GMT 1
Take the caliper off and pump the piston to as far out as you can without popping !
Then push Pistons back in but watch fluid level in reservoir
That dislodged a stubborn air pocket for me when I fitted a new caliper to my Triumph
I had tried everything
Note
You will obviously need to add fluid while pumping the piston out then as you push it back , remove fluid with a syringe and the cover loosely on as it can squirt !
Might sound fiddly but won't take you all day :-) |
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Post by Yogi on Mar 13, 2019 9:19:32 GMT 1
Petey boy
Make sure the hoses are super tight on the banjos
I did everything the same as you once and it turnt out to be pulling air in on the return stroke
Nipped the bolts up tighter and it bled first time
Matt
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Post by petehodges on Mar 17, 2019 22:55:38 GMT 1
got it all sorted today lads massive thanks too you all for your replys as allways
i hung the claipers from the ceiling with wire & bleed them thought , also as good old yogi advise me i nipped the all the banjo bolts up a bit more , then whooooo were in buisness ,
thank you lads
pete
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Post by Yogi on Mar 18, 2019 7:30:31 GMT 1
Happy days  |
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Post by abar121 on Mar 19, 2019 12:26:13 GMT 1
Great! I had a puzzling one recently where the seal on the master cylinder piston had been fitted the wrong way around.
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