 Brake tuning help |
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| carcus |
 Aug 8 2016, 01:25 AM
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#1
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Member  Group: Members Posts: 223 Joined: 16-March 16 From: Colorado Springs Member No.: 19,760 Region Association: Rocky Mountains  |
2 rebuilt rear calipers, all 4 new disc and pads. New master.
Have to hit the brake pedal hard. I think there needs to be adjustments made. About 100 miles on after the brakes were done. I also had new brake rubber lines installed at the same time. I think it is an adjustment problem. Any tips? The brake pedal almost hurts my foot smashing it down and holding it. Even at a stop light. Brake pedal is high and tight, normally, my brakes are lower and ease in. |
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| Cracker |
Aug 8 2016, 05:26 AM
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#2
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Advanced Member Group: Members Posts: 2,148 Joined: 2-February 10 From: Atlanta (area) Member No.: 11,316 Region Association: South East States 
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What size MC & what type of pads? Did you replace all of these parts because of the same condition? I've experienced something similar with a 23mm MC (in a 914). The proportioning valve is another item in-line with the rear brakes - I take it out and this is highly contested. Just another item to consider.
Using phone - sorry for double post. PS: You may need to rebuild 2 more calipers... (IMG:style_emoticons/default/poke.gif) Hopefully, Eric Shea will weigh in on this... Tony |
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| Cracker |
Aug 8 2016, 05:26 AM
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#3
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Advanced Member Group: Members Posts: 2,148 Joined: 2-February 10 From: Atlanta (area) Member No.: 11,316 Region Association: South East States
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What size MC?
Tony |
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| stugray |
Aug 8 2016, 07:59 AM
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#4
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I must be missing something.
Sounds like the OP is complaining about too firm of a pedal..... Do you have a very firm pedal but the car does not stop??? Most people have a hard time getting TO a firm pedal. |
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| Shadowfax |
Aug 8 2016, 09:45 AM
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#5
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Show us the meaning of haste Group: Members Posts: 509 Joined: 19-January 15 Member No.: 18,340 Region Association: South East States
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Sounds like the push rod from the pedal might not be positioned in the MC correctly (No. 20 in diagram).
 If it is installed OK, then check the play and adjust as needed. |
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| mlindner |
Aug 8 2016, 09:52 AM
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#6
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Senior Member Group: Members Posts: 1,523 Joined: 11-November 11 From: Merrimac, WI Member No.: 13,770 Region Association: Upper MidWest
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I think he saying its going down and easy and he's standing on it hard....
Sound like air somewhere. I also would remove Proportioning valve ( I know Eric is against this, and for good reason, it would be a liability for him). I've enjoyed 15 years of Auto-xing and track days at Road America and Black Hawk farms with all kinds of high speed braking on wet and dry...late into a fast turn etc. and never had a rear braking issue. Many 1st in class at Road America with speeds well over a hundred. Just FYI, and always do plenty of brake testing. Mark |
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| stugray |
Aug 8 2016, 09:53 AM
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#7
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
QUOTE(Reverend Troublemaker @ Aug 8 2016, 05:26 AM)  What size MC & what type of pads? Did you replace all of these parts because of the same condition? I've experienced something similar with a 23mm MC (in a 914). The proportioning valve is another item in-line with the rear brakes - I take it out and this is highly contested. Just another item to consider. Using phone - sorry for double post. PS: You may need to rebuild 2 more calipers... (IMG:style_emoticons/default/poke.gif) Hopefully, Eric Shea will weigh in on this... Tony Simple answer - you should NOT have a 23 mm MC in your otherwise stock 914. That would definitely result in an overly firm pedal. |
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| Cracker |
Aug 8 2016, 09:57 AM
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#8
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Advanced Member Group: Members Posts: 2,148 Joined: 2-February 10 From: Atlanta (area) Member No.: 11,316 Region Association: South East States
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Good info (but) I never claimed it was a stock 914 system, just a 914 - I had 930 calipers on all 4 corners.
T QUOTE(stugray @ Aug 8 2016, 11:53 AM) QUOTE(Reverend Troublemaker @ Aug 8 2016, 05:26 AM) What size MC & what type of pads? Did you replace all of these parts because of the same condition? I've experienced something similar with a 23mm MC (in a 914). The proportioning valve is another item in-line with the rear brakes - I take it out and this is highly contested. Just another item to consider. Using phone - sorry for double post. PS: You may need to rebuild 2 more calipers... (IMG:style_emoticons/default/poke.gif) Hopefully, Eric Shea will weigh in on this... Tony Simple answer - you should NOT have a 23 mm MC in your otherwise stock 914. That would definitely result in an overly firm pedal. |
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