 Me vs. Brakes: The Road to a Solid Pedal |
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| Bwingate |
 May 20 2024, 07:25 AM
Post
#1
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Newbie  Group: Members Posts: 19 Joined: 30-March 24 From: New York Member No.: 28,029 Region Association: North East States  |
I have been fighting mushy brakes since I got my 914. They are better but not great. I suspect there is a lot more bleeding to do, including finding the proportioning valve to bleed.
The PO said that they had the master cylinder changed by a local "Porsche expert" I suspect it was replaced with the 17 mm master cylinder. Can I confirm with an external inspection whether it is a 17 mm or 19 mm MC? So my plan is: 1) Bleed MC 2) Bleed proportioning valve 3) Possible replace soft lines 4) Bleed each wheel again. I saw something on this site that made sense, but I had never seen it before: Clamp off all the soft lines and test the pedal. If the pedal is solid, then the problem is at the wheels; if the pedal is soft, then it is the MC. Then unclamp each wheel one at a time - the "bad" wheel will be soft, the "good" wheels will have a firm pedal. Is this a bad idea? |
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Posts in this topic
Bwingate Me vs. Brakes: The Road to a Solid Pedal May 20 2024, 07:25 AM
technicalninja Clamping is OK if you're planning on replacing... May 20 2024, 07:30 AM Geezer914 Get a pressure bleeder, best way to bleed the brak... May 20 2024, 08:11 AM
infraredcalvin
Get a pressure bleeder, best way to bleed the bra... May 20 2024, 08:21 AM
ctc911ctc
Get a pressure bleeder, best way to bleed the bra... May 20 2024, 07:55 PM Cairo94507 Pressure bleeder first for a couple trips around t... May 20 2024, 09:46 AM Bwingate Thanks everyone -
I have a pressure bleeder, used... May 20 2024, 10:27 AM technicalninja The vent clearance has to be tight!
If the rot... May 20 2024, 11:05 AM FL000 When I upgraded my master cylinder recently I deci... May 20 2024, 11:41 AM moto914 Had a hard time myself, last time. Just kept this ... May 20 2024, 12:04 PM 930cabman Don't give up, getting these just right can be... May 20 2024, 12:36 PM friethmiller :agree:
For me, I had air between the bleeders on... May 20 2024, 12:46 PM fiacra Motiv pressure bleeder, three quarts of brake flui... May 20 2024, 12:47 PM technicalninja It does not help to remove air bubbles from the ca... May 20 2024, 01:14 PM 76-914
It does not help to remove air bubbles from the c... May 20 2024, 04:22 PM Dave_Darling The brake master cylinder is under the car. You r... May 20 2024, 05:55 PM r_towle Lots of experience here.
Mine is use another human... May 20 2024, 08:21 PM steuspeed I had a lot of trouble getting a hard pedal after ... May 21 2024, 12:56 AM Superhawk996
Maybe it's the Porterfield RS4 pads I install... May 21 2024, 09:23 AM moto914
Get a pressure bleeder, best way to bleed the bra... May 21 2024, 01:01 PM bkrantz If the pedal never seems firm enough, check to see... May 21 2024, 07:28 PM iankarr You've gotten great advice in this thread. Als... May 21 2024, 09:05 PM wonkipop
You've gotten great advice in this thread. Al... May 22 2024, 12:59 AM Bwingate
You've gotten great advice in this thread. Al... May 22 2024, 05:51 AM emerygt350 Although the stock brakes will never have the grab... May 22 2024, 06:19 AM moto914
late braked into turn 1 at the Glen and ended up ... May 22 2024, 06:38 AM Bwingate Finished up the job this morning and I think I fou... May 25 2024, 10:59 AM emerygt350 Great to hear it. I had my son pumping the brake ... May 25 2024, 02:17 PM emerygt350 I just reread your post... The switch shouldn... May 25 2024, 02:20 PM Bwingate
<<snip>>eaking of that, what size are... May 26 2024, 06:23 AM emerygt350
<<snip>>eaking of that, what size ar... May 26 2024, 11:22 AM Bwingate
[quote name='Bwingate' post='3147397' date='May 2... May 26 2024, 01:25 PM emerygt350 Not the switch. The place where it goes, there sho... May 26 2024, 04:23 PM  |
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