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4th June 2024, 15:48 | #1 |
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Brake problem; Is this mastercylinder problem
My brakes gradually got spongier and spogier. I tried to bleed them but no fluid would emerge from either the front nearside or rear offside cylinders when operating the brake pedal; with and without the engine running.. Only a dribble came out of the other two cylinders when I used a gunson brake bleeder. Is this indicative of a master cylinder problem?
I thought I might take the car to a local garage but I now have zero braking power so that solution is shelved at least temporarily. Fred Connoisseur 2.5 kv6 |
4th June 2024, 16:14 | #2 |
I really should get out more.......
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Hi Fred, first you need to check if you have brake fluid in the master cylinder, its located on the drivers side under the scuttle panel.
Then check the brake pipes at the rear of the car, my guess is that one of the pipes has burst due to rust, if you do have a leak check the floor for a fluid stain. |
4th June 2024, 16:36 | #3 |
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The master cylinder is full and there are no leaks. The front hoses were replaced last year and I have two new ones waiting to be put on the rear. The 80 year D-Day is approaching so will have to relax until that excitement is over.
Thanks for your replay. Fred |
4th June 2024, 20:03 | #4 | |
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Quote:
Simon
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5th June 2024, 08:47 | #5 |
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Thanks for that Simon. I will order a new one . It looks as though Rimmers have them at a somewhat rteasonable price.
Fred |
6th June 2024, 05:29 | #6 | |
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Fred; I would recommend carrying out some checks before a speculative purchase such as Ched suggested:
Quote:
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6th June 2024, 10:25 | #7 |
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I wouldn't write the master cylinder off just yet.
Some braking systems can be quite tricky to bleed, and if there is somewhere air is getting into the system then it won't bleed. There are a lot components in a braking system and plenty of things that you can check before you start swapping parts. You mention the hoses have been changed recently - does that correlate with any of the braking issues? |
13th June 2024, 11:06 | #8 |
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Thank you all for the various comments. I didn't expect that removal of the master cylinder would be so difficult. It was the bottom right hand bolt on the access panel that caused the problems. I eventually removed the upper inlet manifold to gain access. I could see it but couldn't reach it!.
The problem is that the cylinder piston is not uncovering the inlet ports to the brake pipes that go to the wheel cylinders. I presume that either the rubber cups in the cylinder have swollen and are blocking off the ports or they have become dislodged in some manner. The piston will not move back any futher so it must be the seals that are blocking the ports and not allowing the wheel cylinders to re-charge.. The body of the master cylinder has Lucas 3056 stamped on it. I ordered a new cylinder from Rimmers . It is stamped Lucas 3183. It is slightly too large to slide into the servo. I think the master cylinders must have been changed at some stage during the earlier years of manufacture. i cannot find any other source for new master cylinders apart from Rimmers. I could open out the aperture in the servo (by 1.5mm ) or fit a later servo. If I knew which one! Are there any suggestions please? Fred Fred |
13th June 2024, 11:23 | #9 |
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Thankfully I've never had to play around with the brake master cylinders, seems a nightmare as these people (https://allbrit.de/xepc.cfm?PAGE=127...RRJ&SPRACHE=EN) list five of them with presumably different part numbers. You could always ask if they have one that matches yours. I did however find it useful to know there is a repair kit too.
Good luck |
13th June 2024, 14:59 | #10 |
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Thanks for tht info. I'll have to dredge up my German!!
Fred |
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