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TR2/3/3A Toyota Brake Conversion on a TR3A

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PatGalvin

PatGalvin

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Well, I'm almost done with the TR3A Toyota 4-pot brake conversion. Passenger side went fine, once I obtained the TR6 caliper bracket. Cutting the dust shield was quite a hassle and not at all like the VTR diagram. For converting a TR3, you have to take quite a bit more off the dust cover to fit over the caliper bracket.

Problem: My rotor is not centered in the caliper. It needs to shift 40 thousandths towards center. You can't shim it - the caliper bracket actually needs to be a little thinner to bring the rotor to the center. I can ask my machine shop to skim 40 thousandths off the bracket. Any other suggestions on how to handle this?

Pat
IMG_9079.jpg
 
Did you use new felt seals on the rotor/hub assembly?? They are known to be too thick and won't allow the hub to seat in it's proper position. Try removing them first and see if that cures the problem. If so then cut them in half with a new, sharp razor blade, and you should be OK.
 
Hey guys - not directly related to the post here except I had the chance to meet Pat yesterday and get a tour of the TR3 that he's been posting on here. Much fun to hang out, he's a super nice guy, and is doing excellent work. Always a treat to connect with folks here in person.

Anyway....
 
Thanks Skip
Was great to meet you as well. Looking forward to some CA rallies in future months. What was the name of that "Melee" rally to which you referred. My brain is sometimes like a coarse sieve.

I originally installed the hub with no seal at all to check fit and initially adjust the bearings. The photo shown is with no seal installed, so there is no pressure pushing the hub outward against caliper. Given felt seal thickness problem I had, I've been adjusting my bearings by:
1. Remove seal entirely
2. Reinstall hub w/o seal and torque to 10 ft lbs
3. Back off one flat plus enough to fit cotter pin
4. Mark castellated nut with Dremel
5. Then remove hub and reinstall seal
6. Reinstall with same bearing preload as previously marked.

When I cut felt seal on other wheel, this procedure worked great. Guys at TRF recommended I either cut seal or soak in 90 weight oil overnight and then compress in a vice. They also measured seals that they sell and they are much thinner than the seals I got from BPNW. Should arrive early next week and I'll photograph both before final install.

Pat
 
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