 Chasing a firm brake pedal, What next? |
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| robkammer |
 Oct 17 2023, 02:55 PM
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#1
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Member  Group: Members Posts: 200 Joined: 7-January 21 From: Vermilion Ohio Member No.: 25,049 Region Association: North East States  |
Teeners: It's been over two years since our 74 BB arrived. A Caliper blew out as it came off the transporter in 12 degree temps. Really no surprise as the PPI pointed out a leaky caliper. So I did what I thought would be appropriate for this little beauty, I sent all of the hard bits out, calipers and regulator, to a widely recognized firm for 'restoration'. Put in a new EZ master from 914. And all should have been fine. But, even now, after 1800 miles, a second set of calipers from the 'restorer', a new ATE MC from the restorer. ( I threw out the EZ MC). I still have squishy pedal.
I do not suspect the pedal box area as the car has absolutely no rust. I just rebuilt the 'restored' front calipers with new square cuts from AA, took out the springy metal pieces that are supposed to keep the pistons from rotating, and the pedal is much better. I have about 50 miles on this but after bleeding it again the bleeders were leaking and I put it back on the lift. ( I was told: maybe: we left the calipers in the acid too long) So: Now that the pedal seems like I might be on my way to GOOD braking, I can hear the pressure regulator knocking when I press the pedal, at a standstill, in the shop. Is this normal and to be expected? Note: During attempts to bed the brakes and get them working, I was only ever to lock up the rears, and it was really difficult to do. ( difficult may not be accurate, violent might be more appropriate) The newly rebuilt calipers seem fine, just like the calipers in my 911's that I rebuilt. As for bleeding, I've done it every way known to man. And some new ones too. Just picked up a 6th quart of Super 4. $26.00!!! A fifth of Weller was only $23!. I'm really frustrated with this little car. Any input will be appreciated. I'm thinking of putting in a Tee in place of the regulator, just for testing. If anyone has a Tee that they would be willing to let me borrow, I would be willing pick up all of the shipping just so I don't have to mess with the fab work. Thanks,  |
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| robkammer |
Nov 2 2023, 10:40 AM
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#2
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Member Group: Members Posts: 200 Joined: 7-January 21 From: Vermilion Ohio Member No.: 25,049 Region Association: North East States |
Hey Teeners: Finally! I have a the brake pedal I knew should be possible. Everyone helped, thanks again. Didn't need an MC brace. Maybe didn't need to install my own kit in the front calipers, but exercising the seals definitely did the trick. Pulled the pads, cut a couple of shims just in case, pushed the pads out one pump and hooked up the bleeder. Hindsight, 15# of pressure didn't even move the pistons so the shims were just insurance.
A few squirts all around, put everything back together and took a ride. Perfect! It sure would have been nice if the professionals who restored the calipers would have made the suggestion. The best I got from them was; maybe take it on a cross country trip, you need to drive it. (ignoring the fact that I had about 1800 miles of testing already) Anyway, Thanks again to all who were interested! And by the way, right now Autozone has jugs of VR1 on sale for $30. pretty good prince just in time for winter. Cheers! |
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| 930cabman |
Nov 2 2023, 11:31 AM
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#3
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Advanced Member Group: Members Posts: 3,697 Joined: 12-November 20 From: Buffalo Member No.: 24,877 Region Association: North East States 
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QUOTE(robkammer @ Nov 2 2023, 10:40 AM)  Hey Teeners: Finally! I have a the brake pedal I knew should be possible. Everyone helped, thanks again. Didn't need an MC brace. Maybe didn't need to install my own kit in the front calipers, but exercising the seals definitely did the trick. Pulled the pads, cut a couple of shims just in case, pushed the pads out one pump and hooked up the bleeder. Hindsight, 15# of pressure didn't even move the pistons so the shims were just insurance. A few squirts all around, put everything back together and took a ride. Perfect! It sure would have been nice if the professionals who restored the calipers would have made the suggestion. The best I got from them was; maybe take it on a cross country trip, you need to drive it. (ignoring the fact that I had about 1800 miles of testing already) Anyway, Thanks again to all who were interested! And by the way, right now Autozone has jugs of VR1 on sale for $30. pretty good prince just in time for winter. Cheers! "Exercising the seals", can you expand? Took me awhile too. I bet I circled the beast at least 5 or 6 times and still was not happy with the firmness, but over time it got there. |
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Posts in this topic
robkammer Chasing a firm brake pedal Oct 17 2023, 02:55 PM
yeahmag Might try cracking the brake line at the pressure ... Oct 17 2023, 03:14 PM VegasRacer A brace on the Master Cylinder is helpful in provi... Oct 17 2023, 03:28 PM
bkrantz
A brace on the Master Cylinder is helpful in prov... Oct 17 2023, 06:08 PM peteinjp I can only lock up the fronts on my car. Generally... Oct 17 2023, 06:00 PM Krieger Make sure you adjust the venting clearance properl... Oct 17 2023, 10:47 PM Arno914 Just to be sure: Did you replace all 4 brake lines... Oct 18 2023, 01:03 AM robkammer All: Thanks for the replies. I did bleed the top o... Oct 18 2023, 04:45 AM ChrisFoley Tangerine Racing Master Cylinder Brace Oct 18 2023, 04:54 AM jhynesrockmtn As explained in my RR thread, we got stuck in Bend... Oct 18 2023, 08:22 AM rfinegan I may have missed this ...but did you set the air ... Oct 18 2023, 08:50 AM Mikey914 As you can see these are notorious for having issu... Oct 18 2023, 10:05 AM Superhawk996
I can hear the pressure regulator knocking when ... Oct 19 2023, 08:10 AM rudedude I've used old worn out thin pads when initiall... Oct 19 2023, 09:30 AM robkammer All great input. Stopped the leak and took it for ... Oct 19 2023, 10:26 AM iankarr You've gotten great advice in this thread. Als... Oct 19 2023, 10:40 AM mskala Haven't seen this mentioned yet, but with new ... Oct 19 2023, 10:44 AM jhynesrockmtn
Haven't seen this mentioned yet, but with new... Oct 19 2023, 03:11 PM Root_Werks Good thread with good tips. Reminds me I should g... Oct 19 2023, 12:06 PM Krieger I also had a problem with brand new bleeders leaki... Oct 19 2023, 03:21 PM jim_hoyland What’s involved to install the MC brace ? Oct 19 2023, 05:19 PM ChrisFoley
What’s involved to install the MC brace ?
Weld... Oct 20 2023, 04:12 AM 87m491 A few squirts all around?
Hey Teeners: Finally... Nov 2 2023, 02:33 PM robkammer
A few squirts all around?
Hey Teeners: Finally... Nov 3 2023, 06:22 PM Superhawk996
Hey Teeners: Finally! I have a the brake peda... Nov 3 2023, 06:43 AM iankarr Glad you got it sorted!
FYI, the issue with ... Nov 2 2023, 03:17 PM emerygt350 I might give this strategy a shot next spring. Nov 2 2023, 05:41 PM |
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