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ukdave2002
Joined: 23 Nov 2007 Posts: 4109 Location: South Cheshire
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Posted: Sat Aug 01, 2015 6:53 pm Post subject: Girling drum brakes problem |
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i have a problem with the Bedford CA brakes, basically some pressure is being retained in the system after the pedal is released, when driving it builds up to the point where the brakes are completely on ! and the only option is to release some pressure through a bleed screw.
so Im suspecting a mater cylinder problem (the MC is new) or a shoes spring problem ? its a Girling system any advice welcome
cheers
Dave |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22454 Location: UK
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ukdave2002
Joined: 23 Nov 2007 Posts: 4109 Location: South Cheshire
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Posted: Sat Aug 01, 2015 7:26 pm Post subject: |
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Rick wrote: | Are the flexi pipes breaking down/collapsing internally perhaps?
RJ | nope they are all new
Dave |
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Rick Site Admin
Joined: 27 Apr 2005 Posts: 22454 Location: UK
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Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
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Posted: Sat Aug 01, 2015 7:51 pm Post subject: |
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As Rick says. My guess is a faulty valve seal assembly inside the master cylinder or a some foreign matter in there - it only needs to be very small. To be honest I wouldn't fit any new hydraulic cylinder on an oldie without stripping and inspecting it first, the quality can be appalling these days. That's assuming it's affecting all wheels, if just one or two look for bits of crap in the wheel cylinders, and check those flexihoses thoroughly - just because they're new doesn't mean they're good, I've had brand new ones that had a distinctly one way effect. Again, a thorough inspection before fitting is a must these days, I don't think the manufacturers know what quality control means any more |
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D4B
Joined: 28 Dec 2010 Posts: 2083 Location: Hampshire UK
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JP
Joined: 03 Jul 2015 Posts: 30 Location: Norfolk UK
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Posted: Sat Aug 01, 2015 9:43 pm Post subject: |
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If it's both sides it would suggest master cylinder.
One side only would be the relevant hose acting as a one way valve.
This is assuming a servo has never been fitted because that opens another can of vermiforms entirely
Hope you get it sorted OK _________________ John '53 MG TD |
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COMMAD
Joined: 12 Dec 2011 Posts: 176 Location: Gold Coast. Australia
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Posted: Sat Aug 01, 2015 10:30 pm Post subject: |
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I had same problem with my CA , when I first put on road. Problem was in Master cylinder, had it reconditioned with all new parts. Problem solved.. The brake guy said it something to do with the return hole in cylinder body not letting fluid return to top of cylinder. My brakes have given no problems for the last 3 years... |
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emmerson
Joined: 30 Sep 2008 Posts: 1268 Location: South East Wales
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Posted: Sun Aug 02, 2015 4:11 pm Post subject: |
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Before going to a lot of trouble, check that there is some free play on the master cylinder push rod. If its too tight the return valve in the m/c cannot function. A simple thing to miss but vital.
How do I know this?????????? |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4109 Location: South Cheshire
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Posted: Sun Aug 02, 2015 7:14 pm Post subject: |
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Thanks chaps.
I did slacken the control rod yesterday, but didn't cure the problem so I presume it's an internal MC problem. The MC is a new repro jobbie, I can get a new genuine Girling MC for not too much cash so have ordered one. Part of the reason for doing this is that I have come across repro brake parts before and they have different seals ect, that can't be replaced so putting the right part in seems like a better plan
Emmerson it sounds as if you have story ?
Cheers
Dave |
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goneps
Joined: 18 Jun 2013 Posts: 601 Location: Auckland, New Zealand
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Posted: Sun Aug 02, 2015 11:57 pm Post subject: |
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ukdave2002 wrote: | ...I have come across repro brake parts before and they have different seals etc. that can't be replaced... |
Ah, the joys of the modern throw-away world. Slave cylinder leaking? Fit a new one, a cheapie that will also be leaking in less than a year. Disc rotors slightly worn? Fit new ones that'll wear out before the pads. Wheel bearing rumbling? Replace the whole hub. because the bearing can't be removed. And so on—the sheer waste is mind-boggling. Hooray for old cars that can actually be repaired.
Richard |
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Bitumen Boy
Joined: 26 Jan 2012 Posts: 1735 Location: Above the snow line in old Monmouthshire
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Posted: Wed Aug 05, 2015 10:20 am Post subject: |
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ukdave2002 wrote: | The MC is a new repro jobbie, I can get a new genuine Girling MC for not too much cash so have ordered one.
Dave |
Dave, let us know how you get on with that genuine master cylinder. It's becoming obvious that I will have to change the clutch MC on my Herald, and there is likewise a choice between genuine and "alternative" - in fact I wouldn't be too surprised if they were the same parts as for your CA. I've resealed the old one a few times but it's not right, a few fiddly bits inside are quite worn. Given that it's probably 50+ years old, and considering how often the clutch gets used I don't suppose it's done too badly |
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D4B
Joined: 28 Dec 2010 Posts: 2083 Location: Hampshire UK
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Posted: Wed Aug 05, 2015 11:03 am Post subject: |
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I have just read in an old Series 1 Landrover club news letter dated from 1991 that someone was suffering with brakes gradually locking on and could only be freed off by slackening the pushrod adjustment..... he later discovered that it was caused by using silicone brake fluid in a system which was not entirely new, so perhaps a side effect of mixing Dot3 or 4 with silicone?
Food for thought.... |
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ukdave2002
Joined: 23 Nov 2007 Posts: 4109 Location: South Cheshire
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Posted: Sun Apr 03, 2016 5:17 pm Post subject: |
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Bitumen Boy wrote: | ukdave2002 wrote: | The MC is a new repro jobbie, I can get a new genuine Girling MC for not too much cash so have ordered one.
Dave |
Dave, let us know how you get on with that genuine master cylinder. It's becoming obvious that I will have to change the clutch MC on my Herald, and there is likewise a choice between genuine and "alternative" - in fact I wouldn't be too surprised if they were the same parts as for your CA. I've resealed the old one a few times but it's not right, a few fiddly bits inside are quite worn. Given that it's probably 50+ years old, and considering how often the clutch gets used I don't suppose it's done too badly | well I actually got round to changing the MC this weekend, and happily using an original Girling part has cured the problem
Dave |
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