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Post by patrick on Jun 25, 2014 15:52:49 GMT
Hello,
I have a problem with my brake on my P5 3 liter coupe. Everything is new except the master cylinder was rebuilt him. My Behavior: as as I roll my front brake clamp until it locks. I wait a few hours for it to cool off again and I and this again. Do you have any leads?
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Post by johnwp5bcoupe on Jun 25, 2014 20:53:09 GMT
Hello, I have a problem with my brake on my P5 3 liter coupe. Everything is new except the master cylinder was rebuilt him. My Behavior: as as I roll my front brake clamp until it locks. I wait a few hours for it to cool off again and I and this again. Do you have any leads? Hello Patric I know your English is not very good perhaps Cyf may be able to translate? Are the Calipers sticking when hot is that the problem? |
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Post by Warwick on Jun 26, 2014 2:42:46 GMT
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Post by patrick on Jun 26, 2014 12:05:39 GMT
Hello ,
These are not the front caliper because when this happens, I open the bleed a caliper, and only with this operation I unblock all. Hence my question about the master cylinder.
Regards,
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Post by djm16 on Jun 26, 2014 12:16:40 GMT
Try disconnecting the vacuum hose from the inlet manifold to the brake servo.
If the brakes unlock then the problem is the servo and not the master cylinder.
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Post by patrick on Jun 26, 2014 16:46:12 GMT
OK, thank you. I already tried it and it does not release.
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Post by Simon H on Jun 26, 2014 19:11:25 GMT
I have recently had the problem of the brakes staying partly on after releasing the pedal. They would come off after a few seconds but the problem was getting worse and I feared they would eventually stay on for good. As I had a Girling master cylinder seal kit to hand I started with that. And it seems to have cured the problem. The pedal now seems to be more progressive, if that's the right word. Before it took quite a hard press before it moved (a bit like it feels when the engine isn't running and all the vacuum has escaped).
Simon H
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Post by lagain on Jun 28, 2014 17:53:04 GMT
It could be that if the master cylinder is the original the bore may not be smooth and the new seal is sticking, very difficult to check this, but if you have changed every thing else it could be.
Have you changed the flexible hoses
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Post by cyf on Jun 29, 2014 7:54:27 GMT
Patrick, vous avez un message
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Post by djm16 on Jun 29, 2014 8:58:54 GMT
That has to be the servo.
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Post by Simon H on Jun 29, 2014 12:13:29 GMT
That has to be the servo. As already stated, fitting new master cylinder seals cured the hard pedal and brakes staying on scenario... |
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Post by patrick on Jun 29, 2014 18:09:28 GMT
good evening,
Yes hoses have also been changed.
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Post by cyf on Jun 29, 2014 19:55:03 GMT
here's what Patrick said to me:
He changed everything for new items on the brake system (mastervac,hoses, lines, rear cylinders, calipers) except for the master cylinder which was reconditionned.
His problem is that when he drives, without touching the pedal, the brakes apply till they jamed.
He has two solutions: let them cool down or bleed one of thr brake. In the later case the brakes released without any other action.
I know hand over to the specialists
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Post by stantondavies on Jun 29, 2014 20:36:41 GMT
.... when he drives, without touching the pedal, the brakes apply till they jammed. He has two solutions: let them cool down or bleed one of the brake. In the later case the brakes released without any other action. On my past experience, it is either servo or master cylinder. But I have had these symptoms only after applying the brakes which then locked on. As the brakes haven't been applied I would suspect a sticking piston in the servo. Time will tell! |
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Post by lagain on Jun 29, 2014 21:11:03 GMT
If the problem happens without touching the brake pedal surely it can only be the servo, as that is the only part of the system that is connected ?
If the brakes release after a while could it be that the vacuum pressure is releasing ?
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Post by harvey on Jun 29, 2014 21:21:04 GMT
He has two solutions: let them cool down or bleed one of thr brake. In the later case the brakes released without any other action. Slacken the brake pipe between the master cylinder and the servo, if that instantly frees the brakes then because the same freeing off occurs after undoing a bleed nipple at the road wheel, the problem can't be the servo it must be the master cylinder, if they don't free off, then that proves the fault is in the servo. |
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Post by Ken Nelson on Jun 30, 2014 0:21:24 GMT
I had problems with my brakes not releasing that finally turned out to be a clogged air filter on the servo. Replaced it and they worked fine again.
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Post by patrick on Jun 30, 2014 17:55:30 GMT
Hello Harvey,
Thank you for this idea, I'll try this tomorrow manipulation. I am actually allow me to overcome this fault, if it does not work then I will go on the brake servo, but it is brand new, I do not think it is relevant.
best regards,
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Post by stantondavies on Jun 30, 2014 21:53:13 GMT
...... if it does not work then I will go on the brake servo, but it is brand new, I do not think it is relevant. Don't bank on it! Over the years I have had three replacement servos that were faulty. I would put money on it being the servo. |
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Post by patrick on Jul 17, 2014 16:54:36 GMT
good evening,
could you send me a schematic mounting kit for the master cylinder of my 1963 Rover P5 as in your kit, there is an O-ring and the smaller joints in copper, I do not know where they will. In advance, thank you.
best regards,
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Post by enigmas on Jul 23, 2014 21:31:16 GMT
Patrick if you have altered the pushrod length on the master cylinder during the rebuild, this would cause an issue with a release port being blocked. Check the amount of brake pedal free play.
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Post by cyf on Jul 24, 2014 9:04:37 GMT
Patrick, c'est de l'éclaté du maitre cylindre dont vous avez besoin?
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Post by djm16 on Jul 24, 2014 23:01:31 GMT
My brakes also did this when I inadvertently blocked the breather hole in the brake fluid reservoir.
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