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Helo,
My Jimny has failed its MOT last week for “brakes imbalanced across an axle Rear (Axle 2)[1.2.1(b)(i)]”
As advised by the mechanic, I have adjusted the shoes on both sides and cleaned everything up while I was there. When I took it back the test showed 60% on the nearside and around 5% on the offside although the handbrake works fine.
Anyone have any ideas what it might be?
Thanks in advance
It sounds like the slave cylinder is either stuck or dead. If there is no sign of a leak then you might be able to free it off, just don't let the pistons come all the way out as it will make a mess and you will have to bleed the system. Alternatively for the price just get a new one and use it as an excuse to replace the fluid, though be aware that it's likely the fixed pipe is not going to appreciate being disturbed so have a length to hand to make a repair section. In other words expect mission creep.
Temeraire (2018 quasar grey automatic)
Pavement princess or back road menace?
Bellerophon (2024 grello van daily)
ADORJ Attention Deficit Ooooh Race Jimny!
Thanks for the reply. Since then I’ve had new drums, shoes, slave cylinders, rear brake line from the rear axle, a master cylinder, bleed and adjustment. When i lift the rear wheels up and have someone hold the brake pedal down, i can still just about turn the rear wheels.
My MOT tester has recommended using a “T connector” from the rear axle to split the line going to the left and right.
Has anyone had similar issues? Or know any tricks or fixes? Thanks
How old is your jimny, does it have abs? The reason being the none abs cars have a load sensing valve that compensates the rear brakes so just putting a T in would potentially cause it to lock the back axle before the front which is a problem. If it's an abs car it won't have a load valve.
Temeraire (2018 quasar grey automatic)
Pavement princess or back road menace?
Bellerophon (2024 grello van daily)
ADORJ Attention Deficit Ooooh Race Jimny!
It’s a 2008 ABS model. Do you think using the T connector would actually help? Surely there is a pressure issue further along in the system. Im a bit stuck for ideas on this. There’s no leaks, the wheels lock up perfectly with the handbrake and the pedal is solid but rear wheels don’t lock completely.
Any help would be much appreciated
Because the rear brakes are fed from a single line, the original problem, "brakes imbalanced across an axle rear" can only result from a very small number of things, which have already been replaced - essentially shoes & wheel cylinders - and stuck or seized linkages.
You've indicated that there was 60% on the nearside, 5% on the offside - correct me if I'm wrong, the brake line comes from the front of the car to the offside wheel cylinder and then across the axle to the nearside. - this means that the nearside wheel is receiving an adequate flow of brake fluid, and uneven fluid pressure is not the issue, and as such splitting the line with a tee to supply left & right is unlikely to have the desired effect.
Also be aware that to split the line will require the offside wheel cylinder to be replaced with a nearside one as it does not have a bleed nipple.
Please note the use of the term original problem, it is not clear to me whether you are looking at the same problem or a different one - replacing the drums, shoes & wheel cylinders should have fixed the imbalance, whether or not that happened is not clear. you are no reporting that when the service (foot) brake is applied, in your opinion, the rear brake "contribution" may not be up to spec.
The symptom needs to be defined before the cause can be identified.
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