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Question Bongo brake master cylinder.

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1 year 3 months ago #2586 by Gleavehulme
Gleavehulme created the topic: Bongo brake master cylinder.
Hi There,
Could someone please help me out with some advice ob a problem that I have. I left my Bongo on the drive for 3 months unused and when I took it for M.O.T. test on the way I noticed that the front brakes were not biting as they used to but were still working but taking longer to stop. The Bongo passed the M.O.T. test with the advisory that the front pads were low. I took off the brake master cylinder cap and the caliper pistons moved back freely using a rewind tool and put some new Brembo pads on it. Problem solved I thought. However, I noticed that the fluid level did not rise in the master cylinder and although I had solid brakes without the engine running when I started it up the pedal went about halfway down with the servo assist and although the brakes are working, if you keep your foot pressed on the pedal it creeps down to nearly the floor but you can pump it back up again. I bled all the brakes thinking that some air may have got in there but no air came out and the fluid was nice and clean. I removed the brake master cylinder two nuts from the servo to see if it was passing any fluid back past the seals but the servo area is dry.I cannot find any leaks and the fluid level does not go down. I was thinking either its the brake master cylinder somehow packed up or could it be this block with all the pipes in (ABS) that could be at fault and any way of testing either? I have tried to get seals for the master cylinder but NONE appear to be available.
Many Thanks,
Keith T.

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1 year 3 months ago - 1 year 3 months ago #2589 by teenmal
teenmal replied the topic: Bongo brake master cylinder.
I would say its the master cylinder fluid bypassing back into the reservoir, it wont do any harm replacing seals etc considering the age of these old vehicles.

PS this particular tandem MC has a dual proportioning valve.

Take care
Last Edit: 1 year 3 months ago by teenmal.

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1 year 3 months ago #2590 by Gleavehulme
Gleavehulme replied the topic: Bongo brake master cylinder.
Thank you very much. I was rather thinking that I've screwed the master cylinder up somehow changing the pads. The trouble is I can't seem to get any seals as all the places that I have tried say that there are non listed !! I have found a similar looking cylinder on ebay that is supposed to fit a Bongo 2,5 TD with ABS but it looks like its been buried in the ground for a few years and probably is in the same state as mine. Do you know anywhere that I could get seals and please excuse my ignorance but what is a dual proportioning valve. does this mean that it has two pistons inside the cylinder , one for the front brake lines and one for the back?

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1 year 3 months ago #2591 by teenmal
teenmal replied the topic: Bongo brake master cylinder.
Yes it has two pistons (tandem MC), if I get any information about repair kit I will let you know.

Take Care

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1 year 2 months ago #2593 by Gleavehulme
Gleavehulme replied the topic: Bongo brake master cylinder.
Hello There Again,
Today I bought two brake unions and blanked the ends off with liquid metal and removed both of the pipes from the master cylinder and put these unions in. Behold a rock solid pedal with or without the engine running. So,I am assuming that the Master cylinder is not passing fluid.Having said that I bled the brakes another twice without and with the engine running and there is no air in the system(unless it won't come out) and the pedal just goes to the floor when you keep your foot on it but it will pump back up. I have a fairly decent pedal when the engine is not running. Have you any ideas as to what could be causing this fault in the system ? I cannot find a leak anywhere and the fluid level does not go down.Could the problem be in this ABS block where all the pipes go in as I am not familiar with this unit? Also can the Bongo's brakes be bled as normal or are there any special tools needed as I have now acquired an Australian Bongo book and it doesn't tell you much but it keeps mentioning the brake system needs to be pressure filled by Mazda to get all the air out and it keeps going on about putting gauges on the vacuum system on the brakes. All this is rather confusing and I am beginning to lose heart now as the Bongo's been off the road 3 months now and all I did was change the front pads!! Any input from you would be appreciably welcome as I am running out of ideas.
Many Thanks, Gleavehulme.

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