 got the brake issue fixed, then exploded the brake pressure regulator |
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| Type 47 |
 Jan 2 2023, 06:50 PM
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#1
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Senior Member  Group: Members Posts: 782 Joined: 1-June 10 From: St. Louis, MO Member No.: 11,790 Region Association: None 
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We had issues with the rear brakes not bleeding and isolated it to the pressure regulator, so went out and pulled a backup off the parts cars.
the swap fixed the issue and brakes are bled. So we decided to take apart the bad one. Here is what is looks like a part. Those o rings were pretty gummed up preventing the piston from moving.  |
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| Chaznaster |
Jan 2 2023, 07:43 PM
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#2
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Member Group: Members Posts: 297 Joined: 22-November 15 From: Concord, MA Member No.: 19,389 Region Association: North East States
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I always wondered what one of those looked like inside. Thanks for sharing ... Are they rebuildable or is that dangerous (because brakes ...).
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| mb911 |
Jan 2 2023, 07:53 PM
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#3
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914 Guru Group: Members Posts: 6,850 Joined: 2-January 09 From: Burlington wi Member No.: 9,892 Region Association: Upper MidWest
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QUOTE(Chaznaster @ Jan 2 2023, 05:43 PM)  I always wondered what one of those looked like inside. Thanks for sharing ... Are they rebuildable or is that dangerous (because brakes ...). Rebuildable. PMB offers the service or just the kit |
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| zoomCat |
Jan 2 2023, 07:55 PM
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#4
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Member Group: Members Posts: 161 Joined: 13-August 04 From: Cincinnati, OH Member No.: 2,526 Region Association: None
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QUOTE(Chaznaster @ Jan 2 2023, 08:43 PM) I always wondered what one of those looked like inside. Thanks for sharing ... Are they rebuildable or is that dangerous (because brakes ...). Rebuilding looks easy, but how do you calibrate? Do you need to? https://pmbperformance.com/products/pressur...7779c&_ss=r |
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| Superhawk996 |
Jan 2 2023, 08:09 PM
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#5
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914 Guru Group: Members Posts: 5,819 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch
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QUOTE(zoomCat @ Jan 2 2023, 08:55 PM) Rebuilding looks easy, but how do you calibrate? Do you need to? Yes they need to be recalibrated. You do not want a car with too much rear brake bias. Rear brake lock is inherently unstable, and dangerous both to you and others that share the road with you. The curve is in the factory manual. The reality is most folks don’t have the appropriate high pressure gauge(s) or the bench rig to supply the pressure to set it. If simply taken apart and reassembled without changing the adjustment screw, it will be close. Send to PMB for a full restoration is the way to go. |
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| Mikey914 |
Jan 4 2023, 10:52 AM
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#6
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The rubber man Group: Members Posts: 12,665 Joined: 27-December 04 From: Hillsboro, OR Member No.: 3,348 Region Association: None
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Just curious, how is it adjustable? Seems like the bias is set by the spring? (IMG:style_emoticons/default/popcorn[1].gif)
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| zoomCat |
Jan 4 2023, 12:10 PM
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#7
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Member Group: Members Posts: 161 Joined: 13-August 04 From: Cincinnati, OH Member No.: 2,526 Region Association: None
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QUOTE(Mikey914 @ Jan 4 2023, 12:52 PM) Just curious, how is it adjustable? Seems like the bias is set by the spring? (IMG:style_emoticons/default/popcorn[1].gif) You set the preload on the spring. 
Group_6_Brakes___pressure_regulator.pdf ( 97.34k )
Number of downloads: 37Oops, almost forgot this one.
Group_6_Brakes_pressure_regulator_2.pdf ( 186.95k )
Number of downloads: 43 |
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| Type 47 |
Jan 4 2023, 05:27 PM
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#8
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Senior Member Group: Members Posts: 782 Joined: 1-June 10 From: St. Louis, MO Member No.: 11,790 Region Association: None
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QUOTE(zoomCat @ Jan 4 2023, 10:10 AM) QUOTE(Mikey914 @ Jan 4 2023, 12:52 PM) Just curious, how is it adjustable? Seems like the bias is set by the spring? (IMG:style_emoticons/default/popcorn[1].gif) You set the preload on the spring.
Group_6_Brakes___pressure_regulator.pdf ( 97.34k )
Number of downloads: 37Oops, almost forgot this one.
Group_6_Brakes_pressure_regulator_2.pdf ( 186.95k )
Number of downloads: 43so if you just took it apart and put new seals on it do you have to set the preload again? |
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| NARP74 |
Jan 4 2023, 05:54 PM
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#9
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Senior Member Group: Members Posts: 1,063 Joined: 29-July 20 From: Colorado, USA, Earth Member No.: 24,549 Region Association: Rocky Mountains |
Theoretically no if you did not touch the spring adjustment. But then again that is a 50 year old spring, not sure it is as good as new. I think I would get it calibrated again.
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