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Old 21-05-2018   #1
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the misery of rear brakes

I know there's a lot of topics about poor rear brakes on barchettas, have read them all but my MOT problem still not solved.
MOT shows rear brake are very weak, like 10% or less. At the same time parking brake is a lot better at about 15% or so.
Everything that brakes has been replaced recently: parking brake cables, rear brake calipers, pressure regulators. The disks and pads are ok. The actual braking on the road is just great, no worse than my much younger everydays car.

I passed the MOT this time somehow, but what options do I have next year, other than putting some bags of sand to the trunk?
My b is 1996 year, with ABS (not sure if its working) and simple pressure regulators without levers or springs.

Appreciate all thoughts, except for bypassing pressure regulators.
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Old 21-05-2018   #2
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Re: the misery of rear brakes

Have you replaced the flexible rubber pipes, they can collapse and restrict the hydraulic pressure to the callipers.
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Old 21-05-2018   #3
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Re: the misery of rear brakes

For noowing if ABS is working is simple , just go to the road and insuring there is no trafic at the moment lets say roling about 60 KM/H brake the hard you can and if it works you will notice the brake pedal bumpimg fast and the brake marks in the road !!
About rear brake problem it can be also the main brake pump failing in the rear circuit , the hidraulic brake circuit is divided in 2 for safety reasons ! it is comon the seals inside the pump start internal leaking and losing brake pressure !
I presume you have bleeded the rear brakes since you have replaced the calipers ...
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Old 23-05-2018   #4
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Re: the misery of rear brakes

Quote Originally Posted by Dave-M View Post
Have you replaced the flexible rubber pipes, they can collapse and restrict the hydraulic pressure to the callipers.
Good point thanks, will check, however I don't expect these hoses to be the problem as they were inspected by the garage who changed calipers. Also I think it is unlikely that both hoses would collapse in the same way (both my left and right brake are weak). I'd rather believe there's manufacturing defect that causes hoses to bulge or expand and lose pressure. Will check.


Quote Originally Posted by JMSG View Post
About rear brake problem it can be also the main brake pump failing in the rear circuit
Oh my that means new master cylinder, doesn't it.
Yes my brakes have been bleeded properly and there is nothing to complain about the quality of braking on the road.
ABS - I think it doesn't work. Tried to trigger ABS on sand-coated track once or twice, nothing. Also, I wasn't able to connect to ABS ECU with my OBD adapter. However the ABS warning light in the dashboard will not indicate any faults.
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Old 23-05-2018   #5
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Re: the misery of rear brakes

Yes it will mean new master cylinder ! there are repair sealers kit but if the housing is worn out it will not be a lasting fix and it will take more labour hours !! so , i really don't advise it !
does the brake pedal feals spongie ??
strange ABS not working and no warning light !!?
have you checked if the bulb in the dash is ok or worse if it was removed on purpose for hiding the ABS problem ?! does it come on wen you turn ignition on (check ligths test ) ??
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Last edited by JMSG; 23-05-2018 at 23:10.
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Old 20-06-2018   #6
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Re: the misery of rear brakes

My handbrake is pants. It cause me grief at MoT every year (well documented on here).
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Old 20-06-2018   #7
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Re: the misery of rear brakes

I have rear brake problems also, handbrake is fine, new cables sorted that. My problem is uneven braking on the rear wheels, so failed the mot. I think it's the brake compensation valves that are either siezed or the seals have gone, Biggest suprise is the cost of them 200+ for the pair. Apparently they are like hens teath, also ordered a new master cylinder so will be fitting this lot in the next few weeks.
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Old 21-06-2018   #8
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Re: the misery of rear brakes

Quote Originally Posted by Dave-M View Post
I have rear brake problems also, handbrake is fine, new cables sorted that. My problem is uneven braking on the rear wheels, so failed the mot. I think it's the brake compensation valves that are either siezed or the seals have gone, Biggest suprise is the cost of them 200+ for the pair. Apparently they are like hens teath, also ordered a new master cylinder so will be fitting this lot in the next few weeks.
I replaced mine years ago with a couple of copper pipe loops, never experienced any lockup. Unless you drive like a nutter I don't think it would be a problem.
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Old 21-06-2018   #9
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Re: the misery of rear brakes

I did consider doing the bypass idea, but wasn't sure if it would be picked up at the MOT test, I have bought now so will be fitting the new ones,
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