PDA

View Full Version : TR2/3/3A Rear brake adjustments



TFB
06-26-2014, 09:12 AM
Anyone know the adjustment procedure for the 10"rear brake
shoe side screw guides that are in the backing plates with the felt tips?
I applied handbrake and adjusted to just touch the shoes but I am thinking maybe there should be some clearance.
Thanks
Tom

CJD
06-26-2014, 09:32 AM
I adjust so the shoes are one click free of touching. Most drums are not perfect, so I may allow a gentle rub as the drum passes the low point, but it is still completely free most most of the rotation.

Geo Hahn
06-26-2014, 09:44 AM
Me too, tighten until they start to grab, then back off one notch & some slight scuff as they rotate is okay so long as I can easily move past it.

TFB
06-26-2014, 10:12 AM
Me too, tighten until they start to grab, then back off one notch & some slight scuff as they rotate is okay so long as I can easily move past it.

Thanks for replies but I think I wasn't clear.I am not asking about the brake shoe adjustment with the adjuster,but the setting of the 2 screws and locknuts in each backing plate that have felt tips and screw in to hit the shoe web.These are in place of the typical retainer springs that these later brakes don't have.
Thanks
Tom

TR3driver
06-26-2014, 10:22 AM
Tom is asking about how to adjust the threaded support posts, item 60 here

33723
While I think Geo & John are talking about the main adjustment, item 50.

It seems odd that this was never documented, but I've never found where it was. What I did to adjust the posts was to remove the drums and adjust until the shoes were parallel to each other. I don't think there should be any clearance (the shoes still rest on the posts even when the brakes are applied); but I'm not convinced that applying the handbrake will necessarily move them out all the way. But I don't think that adjustment is critical at all, so it wouldn't hurt to try your method (with no clearance).

PS, the posts were only used on a fairly small range of cars, TS15332 through approx TS56376 according to the SPC. My last two TRs didn't have them, but back in the 70s I had TS42xxx which did. TS39781 should have had them, but someone had replaced them with 9" brakes before I got the car.

TFB
06-26-2014, 10:34 AM
Thanks Randall.It doesn't seem like they are made to take any side load with felt tips that would not hold up to more than light pressure.I will check to see if my adjustment left the shoes parallel.
Thanks
Tom

TR3driver
06-26-2014, 02:28 PM
I agree, the posts should not carry any more load than just the force of the shoes levered by the ends of the return springs. But they also need to hold the shoes out far enough that they meet the drums squarely when actuated.