 Brakes don't Bite |
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| bkrantz |
 Sep 1 2022, 08:16 PM
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#1
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914 Guru  Group: Members Posts: 8,170 Joined: 3-August 19 From: SW Colorado Member No.: 23,343 Region Association: Rocky Mountains 
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As part of my rebuild I completely replaced the brake system:
calipers and rear pressure valve rebuilt by PMB new ATE 19mm master cylinder new hard and flex lines new disks and Porterfield R4-S pads I went through many (many!) episodes of bleeding, with different methods. The pedal feels very firm from the first push, and does not pump up. Rear clearance is set at .004". I went through the PMB bedding process, and have driven around a bit. But the braking force seems weak. When I get on the brake pedal, I do not feel any "bite". Another 914 friend drove the car and also agrees. Any suggestions? |
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Replies
| rfinegan |
Sep 19 2022, 10:08 AM
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#2
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Senior Member Group: Members Posts: 1,034 Joined: 8-February 13 From: NC Member No.: 15,499 Region Association: MidAtlantic Region
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Last week I rebuild all 4 calipers, Potterfield pads, 19mm MC and SS flex lines and used the Motiv Bleeder and 2 Qts of dot 4 fluid. Set the Park brake air gap to just dragging/touching and drove local for bedding. Burp the calipers on last time and great High Pedal!
Drove the Tail of the Dragon Friday and the brakes bite good on the 360 mile Highway drive and AWESOME when a little heat for the dragon was applied. Best brakes in 7 years and 2nd 914 car I do have the Original Customs Master Cylinder brace too  |
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Posts in this topic
bkrantz Brakes don't Bite Sep 1 2022, 08:16 PM
Superhawk996 Brake feel is highly subjective.
The obvious thi... Sep 1 2022, 08:51 PM mgphoto 19mm master cylinder, push the pedal harder, they ... Sep 1 2022, 09:54 PM barnfind9141972 I did the same thing and also couldn’t get much ... Sep 1 2022, 10:27 PM Mikey914 The system is notorious for holding bubbles. You w... Sep 1 2022, 11:07 PM ChrisFoley
As part of my rebuild I completely replaced the b... Sep 2 2022, 07:55 AM
Superhawk996
Adjust the rear brake regulator to begin regulat... Sep 2 2022, 09:24 AM
ChrisFoley
[quote name='ChrisFoley' post='3026647' date='Sep... Sep 2 2022, 10:58 AM Superhawk996
[quote name='Superhawk996' post='3026665' date='S... Sep 2 2022, 11:17 AM Superhawk996
Add a master cylinder brace to prevent floorboar... Sep 2 2022, 09:28 AM JamesM
As part of my rebuild I completely replaced the b... Sep 2 2022, 09:27 AM Superhawk996
Can you lock the brakes up if you stand on them?
... Sep 2 2022, 09:31 AM jim_hoyland What MPH would the front lock-up test best be done... Sep 2 2022, 09:57 AM Superhawk996
What MPH would the front lock-up test best be don... Sep 2 2022, 10:06 AM emerygt350 I just went and tried Locking them up tonight (hav... Sep 2 2022, 06:32 PM bkrantz Thanks for all the replies.
Yes, I can lock up th... Sep 2 2022, 07:38 PM Superhawk996
But I still think I should feel more bite and urg... Sep 2 2022, 08:41 PM JamesM
Thanks for all the replies.
Yes, I can lock up t... Sep 3 2022, 12:44 AM Van B I love the motive pressure bleeder. I don’t kno... Sep 2 2022, 08:23 PM bbrock I have essentially the same setup as you and get r... Sep 2 2022, 08:26 PM iankarr It takes several bleeds to get air out of a totall... Sep 2 2022, 10:34 PM Geezer914 Pressure bleeding is the best way to bleed the Bra... Sep 3 2022, 05:20 AM jim_hoyland
Pressure bleeding is the best way to bleed the Br... Sep 3 2022, 06:23 AM gereed75 Different car but maybe a useful data point - I ha... Sep 3 2022, 09:51 AM Superhawk996
Not sure what type of compound the R4S is, but ... Sep 3 2022, 10:07 AM bbrock
FYI - get ready for things to get worse. Copper... Sep 3 2022, 11:12 AM 930cabman
FYI - get ready for things to get worse. Coppe... Sep 9 2022, 01:16 PM bbrock
Sounds as though the consensus is having the abil... Sep 9 2022, 03:16 PM Superhawk996
It was the early version of ABS @Superhawk995 :... Sep 9 2022, 04:47 PM PatMc
[quote name='bbrock' post='3026923' date='Sep 3 2... Sep 15 2022, 10:06 PM jim_hoyland What's a recommended for light daily driving ?... Sep 3 2022, 12:25 PM JamesM
What's a recommended for light daily driving ... Sep 3 2022, 12:49 PM bkrantz Thanks, again. I will try bedding again with some... Sep 3 2022, 08:09 PM michael7810
Thanks, again. I will try bedding again with som... Sep 4 2022, 06:36 AM ChrisFoley I used to sell KFP pads because I liked their perf... Sep 4 2022, 05:02 AM bkrantz I ordered a set of Textar OEM style pads for F and... Sep 5 2022, 07:57 PM jim_hoyland I just ordered the Pagids from PMB, Here’s the i... Sep 5 2022, 08:46 PM Montreal914 Mentioned before but the stock system was designed... Sep 5 2022, 09:12 PM robkammer This is a thread I thought I would need to start. ... Sep 8 2022, 01:25 PM ChrisFoley
venting clearance of 3mm.
Hmm, what? Sep 8 2022, 03:17 PM Superhawk996
On my last spirited drive with lots of hard braki... Sep 8 2022, 03:50 PM robkammer Guys: Oops, not 3mm, .003". Clearance between... Sep 9 2022, 07:39 AM bbrock Hmm. I have PMB plated calipers that I rebuild my... Sep 9 2022, 08:12 AM robkammer Thanks All: Good comments all around. Still not su... Sep 9 2022, 01:14 PM bkrantz I replaced the pads with "stock" Textars... Sep 15 2022, 07:48 PM robkammer All: This is all great info. So, an update, last S... Sep 16 2022, 04:11 PM bbrock
All: This is all great info. So, an update, last ... Sep 16 2022, 06:41 PM Superhawk996
Going on two years and getting tired of screwing ... Sep 17 2022, 11:05 AM michael7810 For $35 you can try a set of Textar pads for ... Sep 16 2022, 04:25 PM ChrisFoley New caliper seals cause a long pedal which will pu... Sep 17 2022, 07:02 AM PatMc I would try a conventional bleeding method…one p... Sep 17 2022, 07:47 AM robkammer Thanks All! Have not checked the pedal box, bu... Sep 17 2022, 01:32 PM Literati914 Man this is frustrating, hate that you’ve not go... Sep 19 2022, 09:20 AM Superhawk996
Man this is frustrating, hate that you’ve not g... Sep 19 2022, 09:48 AM scott_in_nh I very recently got around to installing the KFP 1... Sep 21 2022, 12:48 PM bbrock
I do notice they are getting better, but my quest... Sep 21 2022, 01:44 PM NARP74 The numbers are on the round barrel, mostly on the... Sep 21 2022, 01:59 PM NARP74 For the pedal box flex, I had someone press the pe... Sep 21 2022, 02:04 PM |
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