 Parking brake stuck on - not what I thought. |
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| Halfnelson |
 Jul 9 2025, 10:41 AM
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#1
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Member  Group: Members Posts: 72 Joined: 31-July 17 From: Cornwall Member No.: 21,303 Region Association: England  |
Driving home a few days ago I pulled up at traffic lights and could smell hot brakes. Pulled over to find drivers side rear very hot. Gave everything a check and found the parking brake hadn’t released on that side. Gave the calliper parking brake arm a tap and it snapped back into position. Drove home fine. Investigated today. First was adjusting the handbrake cables. Then re-adjusted rear callipers (which are pretty much brand new refurbished from PMB). Finally pinned back the rubber cover to discover the culprit. The cable was almost totally frayed, and the strands had snagged on the cable outer / cable holder, jamming the parking brake on. Not what I’d expected. My disc is pretty messy now… will this just wear off or do I need to clean it?
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| Halfnelson |
Jul 9 2025, 10:43 AM
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#2
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Member Group: Members Posts: 72 Joined: 31-July 17 From: Cornwall Member No.: 21,303 Region Association: England |
This is the disc…
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| StarBear |
Jul 9 2025, 03:42 PM
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#3
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Advanced Member Group: Members Posts: 2,165 Joined: 2-September 09 From: NJ Member No.: 10,753 Region Association: North East States 
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Great catch!
Maybe some fine grit buffing? |
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| Root_Werks |
Jul 9 2025, 04:40 PM
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#4
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Village Idiot Group: Members Posts: 8,736 Joined: 25-May 04 From: About 5NM from Canada Member No.: 2,105 Region Association: Pacific Northwest
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Sounds like you caught it early enough and didn't keep driving. Yeah, scuff up the rotor a little and it'll be okay.
That cable was probably breaking away for a while. Finally to the point it didn't want to release. Good catch! |
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| Halfnelson |
Jul 10 2025, 03:06 AM
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#5
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Member Group: Members Posts: 72 Joined: 31-July 17 From: Cornwall Member No.: 21,303 Region Association: England |
QUOTE(Root_Werks @ Jul 9 2025, 11:40 PM)  Sounds like you caught it early enough and didn't keep driving. Yeah, scuff up the rotor a little and it'll be okay. That cable was probably breaking away for a while. Finally to the point it didn't want to release. Good catch! Yes, funny I didn’t catch it when I changed callipers but was hidden under the little rubber bellows. Now needs to source new cables. Seem to be out of stock. |
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| GregAmy |
Jul 10 2025, 08:54 AM
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#6
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Advanced Member Group: Members Posts: 2,508 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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I'm less concerned about the pads and rotors as I am that the caliper and piston may have gotten incredibly hot and damaged the rubber seals. It may be worth removing the caliper and tossing a seal kit at it.
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| Flyinlow |
Jul 10 2025, 09:01 AM
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#7
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Flyinlow Group: Members Posts: 83 Joined: 17-October 20 From: British Columbia, Canada Member No.: 24,774 Region Association: Canada
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I agree… gotta have a look
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| Halfnelson |
Jul 10 2025, 09:30 AM
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#8
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Member Group: Members Posts: 72 Joined: 31-July 17 From: Cornwall Member No.: 21,303 Region Association: England |
QUOTE(GregAmy @ Jul 10 2025, 03:54 PM) I'm less concerned about the pads and rotors as I am that the caliper and piston may have gotten incredibly hot and damaged the rubber seals. It may be worth removing the caliper and tossing a seal kit at it. If the seals were damaged what would the symptoms be? I slackened off the inner and outer adjusters, then reset to spec. Did a couple of test runs and Caliper seems to be working fine. Would love to avoid having to break down the braking system again having just rebuilt it. |
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| GregAmy |
Jul 10 2025, 10:43 AM
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#9
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Advanced Member Group: Members Posts: 2,508 Joined: 22-February 13 From: Middletown CT Member No.: 15,565 Region Association: North East States
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QUOTE(Halfnelson @ Jul 10 2025, 10:30 AM) Would love to avoid having to break down the braking system again having just rebuilt it. I get that. If you only drove it a little bit it's prob OK. Watch for fluid leaks (o-rings in the e-brake mechanism) and any stickiness with the pistons retracting (piston seal). Go "Italian Tune-Up" those rear pads and rotors and that should be fine. |
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