Help!!! warning lamp screams....

[amatør]

Hello. I am new in here , and from Norway so my english is a little like Petter Solbergs..
Problem: engine is running , pump brake pedal 8-10 times = warning lamp screams.
Waiting 10 sec. lamp dies.

Installed new servopump , new switch ( mounted on the brake pump,with 2 wires.)
Bleed the system!! New pentosin oil. New brake fluid.
Measured the pressure, 145 bar and stabil, no leaks,
abs working fine.35 pump on pedal when engine shut off. Bomb ok! I welded on a "filler thing " and inserted 90 bar nitrogen.Works perfect.Used it a year !
(Seems like the pressure comes to late back/ to slow when pumping then pedal.)
no lamp when wires are taken off.


Need help.

/ R

[amatør]

anyone??

[BrianSmith_S2]

the alarm can also come on if the fluid level drops too low

[amatør]

Thanks for answering but no thats not it.

[amatør]

Hello again... Now I have installed a new brake booster. Same problem.. Lamp biping after 8-10 pumps on b.pedal.
Pressure to boster is 145 bar . When pumping the pedal seems like the pressure doesnt come back fast enough...??

Need help.......

[Mikes2]

Sounds like the hydraulic tandem pump, also commonly referred to as the power steering pump

[amatør]

Thanks for answering ... But I have installed a brand new pump .
When i have pumped the pedal hard, with engine off, (40 pumps) measuring pressure when I start enginge , takes a couple of seconds and the pressure goes right up to 100 bar ,then It moves slowly up to 145-150...
If the accumulator has failed completely or is almost completely "dead", quick jabs at the brake pedal will cause the hydraulic pressure for the brake servo to drop (since the feed from the pump is slow) and the BRAKE light in the dash will come on until demand has dropped below what the pump can feed. Found this on audifans :

Symptoms of failure

If the accumulator has failed completely or is almost completely "dead", quick jabs at the brake pedal will cause the hydraulic pressure for the brake servo to drop (since the feed from the pump is slow) and the BRAKE light in the dash will come on until demand has dropped below what the pump can feed.

You will notice that you have to depress the brake pedal much harder than you are used to for the car to decelerate acceptably. In some cases the pump does catch up and you find that now you're pressing the pedal way too hard and the wheels start to lock up big time! Newer cars with ABS will not be as dangerous as the older models in this regard.

what does that mean ? Failure on bomb or ....??