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Post by Penguin45 on Jun 17, 2016 16:34:09 GMT
And because Snoopy made me promise that I would:   Waits for sympathetic comments....... Chris. |
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Post by Nick RS on Jun 17, 2016 16:49:40 GMT
Looks have you're having too interesting a time with brakes with this and the handbrake on the other one. Drifting off topic slightly, I visited a place where the RAC (or might have been AA) vans are prepared when they are new. The guys there showed me that they carry a space saver type spare wheel with about four different wheel centres that can cover every PCD and fitting on the market for all the cars that nowadays don't have spare wheels and need a tow to safety. It was the idea of one of the patrolmen; I wonder if he patented it.
Chris, hope you get it fixed soon.
Nick
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Post by snoopy11 on Jun 17, 2016 17:53:00 GMT
I was very sympathetic once I had stopped laughing.
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Post by dave1800 on Jun 18, 2016 0:07:14 GMT
Double sympathy with 2 cars off the road! I would have thought the handbrake needed a reinforcing plate having seen the way some gorillas apply them.
David
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Post by Penguin45 on Jun 18, 2016 6:57:58 GMT
Seemingly, I am that (small) gorilla>
Chris.
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Post by peppib on Jun 18, 2016 11:07:38 GMT
I used to have 3 cars and one weekend about 5 years ago I had managed to break all 3. Didn't go down well with Her Ladyship who wanted to visit her Mother!
If a doddery old g!t like me can refurbish a master cylinder in about an hour (albeit a friend had to remove and replace the connection to the brake pedal as i can no longer get under the dash) I am sure it will be a walk in the park for a wizard mechanic like you Chris.
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Post by Penguin45 on Jun 19, 2016 22:40:09 GMT
Heh - cheers chaps. Snoopy and I had a good go at this today. Master cylinder stripped and cleaned. TBH, there was absolutely nothing wrong with it; even the seals were still mint. Despite the clever RAC chap, the chief suspect remains the brake servo. As a "let's prove it" measure, we by-passed the servo in its entirety. I crawled under the front of the car with the bleeding bottles and found a pool of hydraulic fluid by the n/s tyre. Removing the wheel showed some discolouration of the disc hub and the outboard piston leaking fluid. So, caliper off.  Dust cover looks really horrible.  Yup, carbonised and brittle. That got seriously hot. Pistons and bores thoroughly cleaned and new seals and covers fitted. Pads looked rather glazed, so I'll find a new set tomorrow. So, job half done, fault not proven and car immobilised. Happy days. Chris. |
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Post by dave1800 on Jun 21, 2016 3:29:01 GMT
Maybe worth ckecking the other caliper too (and possibly rear cylinders too)if it got that hot?
Good luck with the servo rebuild
David
Happy days.
Chris.[/quote]
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Post by Penguin45 on Jun 23, 2016 22:56:01 GMT
Right. Picked up a new set of pads and fitted them. O/S caliper is absolutely fine. Haven't really looked at the rears, but there's no fluid loss and the car is rolling.
I have pulled the Powerstop IIB apart, and found the vacuum chamber with fluid in; obviously coming from the piston rod, so that's disappointing given the cost of the seal kit fitted a while back. I suspect that it still doesn't really explain the complete lack of assistance and the way that the engine revs rose when the brakes were applied.
The Lockheed I haven't looked at yet. Management has sanctioned me spending a bit of money on a brand new servo unit, which obviously comes with warranties and useful stuff like that. Being brand new, if Chinese, there may be a chance of some sort of service life. Hopefully that will sort things out.
Chris.
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Post by dave1800 on Jun 24, 2016 0:14:08 GMT
Right. I suspect that it still doesn't really explain the complete lack of assistance and the way that the engine revs rose when the brakes were applied. Chris. Perhaps the rubbers in the seal kit were just too old and failed prematurely? The engine revs rise when you remove the oil filler cap and I believe the servo would also be leaking air into the inlet manifold if the non return valve was not functioning, more so if your fuel mixture is a bit rich. The lack of servo assistance is probably due to the system not maintaining pressure, as would happen with a leaking master cylinder. David |
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Post by paddymk2 on Jul 3, 2016 22:13:45 GMT
Hey Chris,
thanks for these posts - the photos are really useful at what to expect.
Paddy
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Post by Penguin45 on Jul 4, 2016 19:30:28 GMT
Thanks chaps.   One Indiana Jones style servo bracket. I'll give it a lick of top coat later, then I can move this forward. Chris. |
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Post by Penguin45 on Jul 5, 2016 17:21:01 GMT
Bracket is bolted home and the servo has been hung upon it.  There was quite a lot of flex with the weight added, so I've made up a nose strap which bolts to the inner wing.  That's made it all pretty solid. Perhaps 2mm steel instead of 1.5mm might have reduced the flex. Anyway, that's not going anywhere. Just new brake lines to make up and we'll see what happens this time. Chris. |
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Post by Penguin45 on Jul 8, 2016 20:47:58 GMT
Brake lines made and fitted. Look quite factory. Drained the system through the o/s front caliper. It's cooked the dust cover, but isn't leaking. Coukdn't see it until I pulled the pads. It shows that both calipers were locked on. Unlikely that two previously working calipers were seized.
Chris.
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