[Mueed]

Hi, we had issues recently with the rear car height and brakes and we changed the brake pumps. The brakes and car height became normal for a while, but now suddenly the rear brakes won't work normally at all and the car's rear won't lift to its normal height either. The 'pressure low' warning lights also continuously display.

What should we possibly look into now? New member here so any help will be kindly appreciated! much thanks.

 

[Jean7]

Hope your brake pumps comes from a serious source. Where did you get them ?
Could be front brake accumulator with broken membrane both.
If you front sphere are old, this is the simplest and obligatory to start with

Also flush and bleed LHM

Could be brake accumulator vavle body, check second line, this is connected directly to the front sphere.

Could be also Height control valve, check here first items

https://www.flyingspares.com/catalog/category/view/s/vin-20001-onwards/id/8354/

This is too start

 

[Mueed]

Hope your brake pumps comes from a serious source. Where did you get them ?
Could be front brake accumulator with broken membrane both.
If you front sphere are old, this is the simplest and obligatory to start with

Also flush and bleed LHM

Could be brake accumulator vavle body, check second line, this is connected directly to the front sphere.

Could be also Height control valve, check here first items

https://www.flyingspares.com/catalog/category/view/s/vin-20001-onwards/id/8354/

This is too start

Thanks for your input! We bled the LHM and the brake lights have gone off and the car's rear height is at its normal too. The brakes were fine but when we press the pedal, the warming comes on for less than a second before going off again. We believe it might be accumulator with broken membrane?

 

[jeyjey]

Could just be a low gas charge rather than a broken membrane. The rubber hoses can also perish on the insides causing blockage and all sorts of strange symptoms. Do you know how old they are?

 

[Jim Walters]

Yes, you have a failed brake accumulator sphere. With no nitrogen pressure reserve, pressing the brake pedal drops the pressure in the system to almost nothing which illuminates the brake warning light, then the brake pump immediately brings the pressure back up high enough to turn off the warning light as it has no nitrogen to push against. Fluids are not compressible so just a couple pumps of the brake pump will bring the pressure back up. Replace both spheres now, the other one will be close behind the completely failed one.