squire Posted February 12, 2008 Share Posted February 12, 2008 Im having problems bleeding the rear brakes on my 109 (servo assisted). I have fluid coming to all cylinders but still have to pump twice to get a good pedal which goes soft when released. Ive checked for leaks and all is fine If I clamp of the rear flexable pipe the pedal is prefect. Ive pumped about 3 liters through it over the past month or so. Any advise welcomed Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted February 12, 2008 Share Posted February 12, 2008 You adjusted the rear drums? Sounds like the shoes are springing back too far. Quote Link to comment Share on other sites More sharing options...
bill van snorkle Posted February 13, 2008 Share Posted February 13, 2008 Do you have the brake shoes on in the correct positions? They are not all the same, there is a leading and trailing shoe and if fitted incorrectly the snail cam adjusters don;t line up properly with the pegs on the brake shoes. Bill. Quote Link to comment Share on other sites More sharing options...
Miffy2A Posted February 13, 2008 Share Posted February 13, 2008 I've always hated the series brake bleeding trauma. Mine is a remote servo so even more hassle. Took me a long time to get a firm pedal, here's what I do: Get some nice big clamps, remove the brake shoes all round and clamp up all the cylinders so they are as compressed as possible. Bleed down at each of the cylinders. Replace shoes/springs/drums. Tighten the shoes up fully on the adjusters so they lock off the drum, back them off until it's free to spin. Repeat for each drum. If you still have to pump up the pedal, then it's worth checking the state of the adjusters (cheap but a bit awkward to replace) and fexi hoses (2 x front 1 x rear). If all these are good, I'd look towards a fault in master cylinder or servo seals. Good luck! Quote Link to comment Share on other sites More sharing options...
bill van snorkle Posted February 13, 2008 Share Posted February 13, 2008 I've always hated the series brake bleeding trauma. Mine is a remote servo so even more hassle.Took me a long time to get a firm pedal, here's what I do: Get some nice big clamps, remove the brake shoes all round and clamp up all the cylinders so they are as compressed as possible. Bleed down at each of the cylinders. Replace shoes/springs/drums. Tighten the shoes up fully on the adjusters so they lock off the drum, back them off until it's free to spin. Repeat for each drum. Good luck! Strangest thing is that due to my portal boxes I had to mount the backing plates so that the wheel cylinders are in the 4 and 8 o'clock position left and right side, which should in theory be a real cow to bleed, but in practice they bleed up very quick and easy.On standard setups I used to adjust the brakes up hard on 3 wheels, and back the adjusters right off on the wheel I was bleeding .I found that the pistons moving out and in at their full stroke when pumping the pedal seemed to expell the air more quickly. Bill. Quote Link to comment Share on other sites More sharing options...
squire Posted February 14, 2008 Author Share Posted February 14, 2008 I think Im sorted. I had the leading and trailing shoes on the wrong way round. Cheere for the advice Quote Link to comment Share on other sites More sharing options...
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