dpb Posted April 15, 2022 Report Share Posted April 15, 2022 Hi Pulling my hair out. I have replaced rear cylinders, brake pipes, welded up the ruts the handbrake lever made, bled the brakes, greased all the relevant sliding parts, and still the brakes refuse to slide as they are supposed to. Only the cylinder piston-side shoe moves, and then occasionally the piston comes out too far and leaks. I have done the work at least twice to ensure all was correct, but to no avail. My last hope is that the doing it with the brake drums on will work, but then I can't see if does or not, or if the cylinders are leaking. Any suggestions? Dave === Quote Link to post Share on other sites
RobH Posted April 15, 2022 Report Share Posted April 15, 2022 (edited) I think it will only work with the drums on Dave. The moving shoe has to be stopped by the drum before any force is transferred backwards to move the cylinder. Without anything to react against, the piston just keeps going as you have found. Edited April 15, 2022 by RobH Quote Link to post Share on other sites
stillp Posted April 15, 2022 Report Share Posted April 15, 2022 +1. They won't work with the drums off. You can watch them slide from behind the backplate. Pete Quote Link to post Share on other sites
Rob Salisbury Posted April 15, 2022 Report Share Posted April 15, 2022 +2, With the drums on it's only a slight movement unless you have not adjusted the brake shoes so that they just slightly rub when you turn them (hand brake cables disconnected), however make sure that the brake pipe has sufficient flexibility to move with the cylinder. Cheers Rob Quote Link to post Share on other sites
RogerH Posted April 15, 2022 Report Share Posted April 15, 2022 Hi Dave, are you able to move the slave cylinder back and forth with your hands (even a small amount)?? If yes then put the drum on and off you go. If no, then consider opening the groove in the slave where the plates slip in to give it a tad more tolerance. Roger Quote Link to post Share on other sites
jerrytr5 Posted April 15, 2022 Report Share Posted April 15, 2022 Have you smoothed off the ridges where the shoes slide? As Roger says, move the whole cylinder/brake shoe assembly back & forth by hand to check. Jerry Quote Link to post Share on other sites
Tr4aJim Posted April 15, 2022 Report Share Posted April 15, 2022 This - “Have you smoothed off the ridges where the shoes slide” When I rebuilt the rear brakes on my TR4A (live axle) the cylinders did not move freely in the backing plate. I found that some “flash” from that casting process was present where the cylinders traveled in the plate. I filed that excess material off, and they moved freely. Also verify you have the 3 securing clips installed correctly. Here is a link that lists the correct procedure. https://www.macysgarage.com/wheel cyl install.htm Jim Quote Link to post Share on other sites
Andy Moltu Posted April 16, 2022 Report Share Posted April 16, 2022 You should be able to slide the cylinder by hand - not easily but clear sliding. If not run a file in the slot and check you have no restriction before putting the retaining shims back on. Neither the hand brake nor the foot brake will move the cylinder until the drum is in place to react against. The resistance the springs provide is equal on both sides of the wheel cylinder so will not move it. Quote Link to post Share on other sites
Bfg Posted May 25, 2022 Report Share Posted May 25, 2022 Might I ask.. what brake shoes are recommended for a normal-road-use TR4A.? Mine are well worn, although the brake calipers have been replaced twice in the last 30k miles ..which most likely those shoes have been fluid leaked upon and cleaned off on those occasions. It's time to pull things apart front and rear, and to reset their clocks, so to speak. Cheers, Pete Quote Link to post Share on other sites
BlueTR3A-5EKT Posted May 25, 2022 Report Share Posted May 25, 2022 (edited) I’d say standard unless you feel your brakes all need up rating Shoeset is GBS778 https://www.jamespaddock.co.uk/brake-shoe-axle-set-4 Edited May 25, 2022 by BlueTR3A-5EKT Quote Link to post Share on other sites
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