Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 03-06-2018, 05:47 AM   #1
Bru
Bone Stock w Upgrades ;-)
 
Bru's Avatar
 
Join Date: Apr 2010
Location: Tampa Bay
Posts: 201
Bru is on a distinguished road
Default MKIII Rear Brake Overhaul / Toyota Rubber Grease

I was monitoring my rear brake pad wear and discovered that the inside pad at the bottom was wearing much faster than the top while the outside pad was square and wearing evenly. I came to the realization that the lower slide pin was being gripped by the rubber boot that it slides in because I had used petroleum-based grease (bearing grease) which swells up the rubber and grabs the pin restricting movement so that it can't back away. Why the outside pad wore, square I don't know. The upper pin is in a metal bushing so it doesn't matter which type of lubricant you use and the manual does not specify. The Toyota manual says to use Lithium base glycol soap grease (08887-01206). Toyota calls it rubber grease. You're supposed to use it on the caliper seal and piston, inside the slide pin boot for the pin to slide and on exterior rubber parts. If you use the wrong kind of grease on the piston seal it will swell up and grab the piston and keep it from moving properly like the slide pin. Rubber grease is about $15 a tube at the dealership but I picked up some on eBay for less. It's pink in color like some of the accessory bags that come with Toyota brake parts. Some people use silicone grease, but I'm not taking any chances. I got rebuild parts for the caliper on eBay and Beck-Arnley rotors from RockAuto. The pads were PBR premium ceramic that came with shims attach so I didn't have to buy a shim kit. I did the parking brake with Centric premium brake shoes but they needed a tweak where the parking brake arm rivet goes through. I had to press one out and clean up the burs and press it back in. Someone on Amazon had the same issue. Centric uses a gripy semi-metallic shoe compound where stock, I believe, is organic compound. Its basic function is a parking brake and it's a piss-poor emergency brake, even brand-new. There is just not enough surface area on the shoes to stop a heavy car quickly. After bedding the shoes and the disk pads, the results are a little better than before the overhaul. I had to make a tool to get the spring retaining pin caps for the shoes to twist on and stay on. I took a 14 mm 3/8 drive craftsman socket and put masking tape across the top in 2 directions, then I poked a hole in it. I put the socket on a 6 inch extension with a 3/8 to 1/2 converter on the end as a handle. The tape provided enough friction to grip the spring cap and twist it while pushing down to get the retaining pin through the slot in the top of the cap while holding the pin base against the back plate with the other hand. I checked the run-out on the disks with a nice clamp-on dial indicator tool kit from Harbor Freight. The limit is 0.005" The best I could do on one side was 5 thousandths after moving it around the 5 positions possible (the worst one was 7 thousandths and out of spec). The other side was 0.002 on the 1st try and I stopped.

See photo
Attached Thumbnails
Click image for larger version

Name:	Rubber Grease.jpg
Views:	362
Size:	45.8 KB
ID:	4990   Click image for larger version

Name:	RR  03-04-18.jpg
Views:	254
Size:	78.5 KB
ID:	4991  

Last edited by Bru; 06-09-2018 at 03:22 PM.
Bru is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
MKIII Wilwood 12.9" Rear Brakes With Parking Brake ARZ Arizona Performance 0 08-25-2010 06:34 PM
HELP PLEASE Nick0887 Non-Generation Specific Questions 4 02-28-2009 07:26 AM
Dream Offer Karma_Supra MKIV Supra 22 10-17-2007 03:04 PM
Wilwood MKIII Rear brake kit ARZ Arizona Performance 0 03-16-2007 07:46 AM
Test-drive the 2007 Toyota FJ Cruiser at Route 22 Toyota silly Off Topic Forum 1 07-07-2006 07:07 PM


All times are GMT. The time now is 01:06 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87