Like you didn't already know, Rear brakes self-adjust poorly |
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Like you didn't already know, Rear brakes self-adjust poorly |
mskala |
Jul 18 2004, 03:02 PM
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#1
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
Even though I have a Garretson proportioning valve that keeps the
pedal feel pretty good, there's always a bunch of free play before the brakes start really working. Anyway, I had an excuse to get into the rear wheels, and I adjusted all the adjusters like 1/32 of a turn back from where they grab the wheels. The pedal free play was much much less and all was right with the world. Of course about 3 days later we did the autocross, and by the time I was driving home the excessive free play was back. . (IMG:style_emoticons/default/smash.gif) (IMG:style_emoticons/default/headbang.gif) If this wasn't a street car in a stickler inspection state, and a sort-of 'classic' car that I want to keep close to normal, I'd go to a real rear caliper design. |
type47 |
Jul 18 2004, 03:19 PM
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#2
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Viermeister Group: Members Posts: 4,254 Joined: 7-August 03 From: Vienna, VA Member No.: 994 Region Association: MidAtlantic Region |
if you went to the real rear caliper design, what would you do about an emergency brake?
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SLITS |
Jul 18 2004, 07:51 PM
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#3
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
The actual adjustment is 0.008"............. 1/32" equates to 0.03125. Hmmmmmmmm (IMG:style_emoticons/default/unsure.gif)
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mskala |
Jul 18 2004, 08:17 PM
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#4
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R Group: Members Posts: 1,925 Joined: 2-January 03 From: Massachusetts Member No.: 79 Region Association: None |
QUOTE(SLITS @ Jul 18 2004, 08:51 PM) The actual adjustment is 0.008"............. 1/32" equates to 0.03125. Hmmmmmmmm (IMG:style_emoticons/default/unsure.gif) I'm sure it's also related to the cubit (IMG:style_emoticons/default/laugh.gif) But seriously you would have to know the threads per inch and tolerance of the screw and use pi in there somewhere. The important part is that the 0.008 which is factory spec would be crappy even if it turns out to be accurate. The front brakes are spec'ed for 0.002 (as I'm sure most other regular disc brakes are). I have never heard anyone claim that you must set to 0.008 or bad things will happen. So my method is get as close to dragging as possible. I just wish it would last. |
SLITS |
Jul 19 2004, 09:36 AM
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#5
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None |
I set 0.004" and they stay great for a period of time. I didn't look, but you're running a /6 - the pistons are a few mm larger and put more pressure on the pads. Maybe they just wear faster. (IMG:style_emoticons/default/confused24.gif)
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Cap'n Krusty |
Jul 19 2004, 05:27 PM
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#6
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
Long ago, and far, far away, the instructor at P-car school said to ignore the 0.008" figure and use 0.004" (measured at the thickest point of the rotor). It works, and resolves most of the low pedal issues I've ever encountered. I can't recall any time when the adjustment got loose enough to recognize as a problem, but then I don't work on many track cars, and the couple I've done in the past didn't have stock brakes. Going to a system where you lose the handbrake is shaky, at best, and illegal in most (if not all) states. The Cap'n
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