- Joined
- May 5, 2011
- Messages
- 1,152
MOT time yesterday and it failed on the rear brakes not achieving enough pressure. Front brakes are absolutely fine.
No matter how much pressure is applied to the brake pedal it only just stops the rear wheels from turning. I wonder if the brake proportioning valve on top of the rear axle is playing up. Having done a bit of research on the internet a new one is around £400-£500 pounds.
In the end we managed to get the Patrol through the MOT but it only just touches the green section on the measuring equipment. Not ideal when most of the time I am towing near max capacity and therefore would like my brakes to work properly. I know that a pass is enough but I am relying more on the front brakes to stop nearly 6 tonnes.
Before buying a new proportioning valve I wonder if anybody has taken one apart and if it can be cleaned up inside. It is a piston that moves side to side and after 22 years is probably a bit tatty on the inside. I asked ‘my’ mechanic and he discourages it and will only replace the valve in its entirety.
Any ideas/advice?
No matter how much pressure is applied to the brake pedal it only just stops the rear wheels from turning. I wonder if the brake proportioning valve on top of the rear axle is playing up. Having done a bit of research on the internet a new one is around £400-£500 pounds.
In the end we managed to get the Patrol through the MOT but it only just touches the green section on the measuring equipment. Not ideal when most of the time I am towing near max capacity and therefore would like my brakes to work properly. I know that a pass is enough but I am relying more on the front brakes to stop nearly 6 tonnes.
Before buying a new proportioning valve I wonder if anybody has taken one apart and if it can be cleaned up inside. It is a piston that moves side to side and after 22 years is probably a bit tatty on the inside. I asked ‘my’ mechanic and he discourages it and will only replace the valve in its entirety.
Any ideas/advice?