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I have a 99 rangerover hse 4.6l, My problem is on application of the brake pedal the brake, traction control and ABS light light up for a split second i have tried the ABS and traction functionality and all appears to working correctly. I tried some basic tests i have checked ABS wheel sensors and plugs brake pedal switches, While trying to replicate the lights i held the brake pedal down and activated both brake switches above the pedal by hand with no activaction of the lights. Also i have noticed my Wabco electrical brake pump cycles every 1 minute or so. I had the key off and pumped the pedal 30-40 times and then switched the key back on and the brake pump was activated for about 30 seconds then it stopped and continued the cycle every minute. I am suspicious of my accumulator been faulty is there any way i can test this accumulator also the pump activates on every application of the pedal

Submitted: 181 days and 2 hours ago.
Category: Car
Value: $13
Status: AWAITING CUSTOMER ACTION

Answer

Those lights that are coming on due to low brake pressure in the system.A simple test is pump the brakes with engine running, a good accumlator should be able to handle at least 3 full pumps before the pump turns on. If the brake pump is not abnormally noisey you should be able to just replace the brake pump accumlator. It is about the size of a baseball mounted on top of the brake pump assembly, and far cheaper to replace than the entire brake pump assembly. I would also recommend that you replace the brake pump relay mounted in the fuse panel behind that battery at the same time.

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Expert: Dave
Pos. Feedback: 97.7 %
Accepts: 
Answered: 5/26/2009

Land Rover Shopforeman

Land Rover Master Technican/ASE Master Technican. 12 years Land Rover Experience

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