markcro
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Everything posted by markcro
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The ease and lack of pressure that the brake pedal goes to the floor would mean that the system was full of air, and after two weeks and 2 litres of fluid I can't see that could be?? Even if it has a caliper full of air I would expect a spongy pedal but at least some kind of pressure?? Yes the new MC is TRW. If this is a case of the new MC being faulty I will go mental!! >:( I am not sure if this is a single of dual brake system. How do I tell? There is only one line coming out of the MC. (late 1973 GT6 Mk.3)
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michael_charlton wrote:Getting bubbles doesnt necessarily mean theirs a leak eg fluid going somewhere, but it does mean you are sucking in air from somewhere How old are the brake cylinders at the rear? If you have a servo have you had this checked? I would say that the rear brake cylinders are 39 years old! ;) But surely these would be leaking fluid and quite alot if they were the cause of the pedal going to the floor? The servo is also original. I haven't touched this.
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thescrapman wrote:Are you saying that it you pump very quickly on the brakes, you get a hard pedal, but then a press shortly after goes to teh floor? Cheers Colin This is exactly what I was getting on the original MC. But now with brand new MC is only slightly firms up after pumping.
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Thanks guys. - This is a brand new MC that I bought and installed. (I bought the rebuild kit for my old one and then thought to myself that I may as well eliminate all doubts of it working or not.... :o ) But I suppose it is possible to get a faulty one off the shelf. - The back brakes are all done up tight against the adjustors.
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michael_charlton wrote:Have you pumped the pedal and quickly checked the m/cyl for any bubbles coming back up? Have you done anything to the brake cyls ? I have pumped the pedal quickly but didn't check for bubbles. I will do that. What will it mean if there are bubbles? I rebuilt the front calipers with new seals and 4x new pistons. I was thinking that maybe something is wrong there, but then again with the pedal going to the floor there should be puddles of fluid on the ground or wheels if the piston seals were leaking...?? I'll give them a look anyway.
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This is a pain in the hole. I just painted the bulk head so it is all nice and shiney. So if I have to take off the brand new master cylinder and mes sit all up again.... :'(
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No, no, I meant that when everything is done up tight that I don't loose any fluid. But yet the pedal goes straight to the floor. When I was bleeding them I passed a full 2 litres of fluid through the system. And fluid isn't exactly cheap. :-/
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Thanks Roy, but the thing is that I'm not loosing any fluid either. I could pump the pedal all day long and it will go to the floor, but the level in the reservoir will remain the same. I was going to use petrol leaking from it's crappy "new" fuel pump and a Zippo lighter! :P Okay I will try the servo and see what happens. To bypass it I will need to buy brake lines etc. to link up the line?
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Yes please! I'll meet you in the beer garden! 8) Where did you get the rebuild kit for the old pump?
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As the title says.... I ask this as I have just bought one from one of the big suppliers and it is pure dirt. The bowl was full of metal swarf, the mesh filter is made from nylon plastic so from new it had wrapped and shrunk and is useless as as filter. And then last night I spent 2 hours fitting it and messing around trying to get it to stop p1ssing petrol out onto the floor from it's badly sealing top cap. I'm sending it back. Fed up with such poor quality parts. >:(
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Right I am just short of pushing my GT6 out into the road and burning it out!! :B Last month I fully rebuilt the front brake calipers and refurbed the rear brakes. When I put it all back together and bled the system I found that the brake pedal would go to the floor. - I rightly or wrongly diagnosed the problem as the Master Brake Cylinder seals had gone. As pressure would build if you pumped the brake pedal. - So new Master Brake Cylinder fitted. And over two weeks I have put 2 litres of fresh brake fluid through the system and tried every which way to bleed it............... but the pedal still goes to the floor... :X :'( There are no leaks, and even if there was I would expect fluid to be squirting everywhere with the pedal going straight to the floor without any real pressure........... :-/ This can't be an issue of air in the system as I have bled it in so many ways and with so much fluid. And even if there was air in the system I would expect somewhat of a pressurised pedal if not a bit spongey. But there is nothing. :( So any suggestions? When I press the pedal and it goes to the floor I do hear a click or pop type noise coming from the brake servo area. Is that normal? All this lovely weather and I had planned to have the car on the road two months ago! grrrr!
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5848 wrote:Im struggling to remove the pistons on mine. I don't have the luxury of compressed air. Any ideas? I rebuilt mine last month. To get the pistons out of mine I firstly extended the pistons out as far as possible while on the car by pressing the brake pedal. I then removed the caliper from it's bracket and wrapped it in cloth and pressed the brake pedal again which will cause one piston to pop out (as well as a lot of fluid!). I then disconnected the brake lines and put the caliper in a vise. With the piston to be removed facing the ground, I used a large flat head screw driver and a mallet to rap around the lip in the piston until it came out.
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esxefi wrote:tssc are in the process of getting the sealing block made in steel,don't know if they are ready yet but may well be worth getting one if you are taking the sump off anyway.fit and forget. :) Yes I have seen their catalogue and it's in their now in steel. Can't remember if it's for the GT6 specifically or are they all the same?