kermit_rr

Very

Full Member

• Jul 2, 2021

• #1

system pumps up to pressure when you start up no problems and the accumulator is healthy enough with the pump only running briefly on every 4th pedal press, so far so good.
once the engine is switched off, it seems to lose huge amounts of pressure and seems to be getting worse. theres no leaks, i've never had to top up the brake fluid so i'm assuming there is a seal somewhere (in the pump?) letting oil past, back to the reservoir?
Is there anything else it could be or any checks I should do?

 

T

tomcat59alan

Well-Known Member

• Jul 2, 2021

• #2

Any air in the system? Did you let the system pressurise before topping up to the full line on the reservoir?

 

kermit_rr

Very

Full Member

• Jul 2, 2021

• #3

I've not checked for air but I've never had a soft pedal. I've never had to top up but it's due for a fluid change.. if there's a problem that's fixable I'd rather do that before going through the ordeal of a flush

 

RangeRoller dt

Well-Sprung Member

• Jul 2, 2021

• #4

When’s last time you changed the fluid?

 

kermit_rr

Very

Full Member

• Jul 2, 2021

• #5

Ages ago, do you think that's the problem?

 

RangeRoller dt

Well-Sprung Member

• Jul 2, 2021

• #6

My accumulator isnt great but okay. It keeps pressure for while after shut down unless I repeatedly pump the pedal with it off. I have changed my fluid regurlarly though, just thought if it’s stuff that came with the vehicle could be yonks old. May not feel it with the servo system?

 

kermit_rr

Very

Full Member

• Jul 2, 2021

• #7

I replaced the accumulator soon after i got it, brakes have been perfect, just loses pressure after an hour or 2, used to take overnight

 

RangeRoller dt

Well-Sprung Member

• Jul 2, 2021

• #8

I wouldnt worry. Unlikely you will need the brakes 2+ hrs after switching it off, if you do turn it on again
Check for leaks or bubbles see what you can find. fluid hasn’t gone down probably not a fluid leak.

 

kermit_rr

Very

Full Member

• Jul 2, 2021

• #9

I worry because what if it gets to the point where the pump is running all the time?

 

RangeRoller dt

Well-Sprung Member

• Jul 2, 2021

• #10

If it holds pressure and brakes well it works? If it comes to ^^^ then you fix it. Don’t think it warrants replacement yet at four pumps but keep an eye on it like we all do
Nothing wrong with further investigation

 

kermit_rr

Very

Full Member

• Jul 2, 2021

• #11

You mean ignorance is bliss?

 

RangeRoller dt

Well-Sprung Member

• Jul 2, 2021

• #12

They are designed to work with engine running. works 2 hrs after is overkill

 

RangeRoller dt

Well-Sprung Member

• Jul 2, 2021

• #13

You’ve got me thinking about new callipers now
£70 I want them but got enough to do with screen and mot

 

Grrrrrr

Technician, Bodgit & Scarper Ltd

• Jul 3, 2021

• #14

kermit_rr said:

system pumps up to pressure when you start up no problems and the accumulator is healthy enough with the pump only running briefly on every 4th pedal press, so far so good.
once the engine is switched off, it seems to lose huge amounts of pressure and seems to be getting worse. theres no leaks, i've never had to top up the brake fluid so i'm assuming there is a seal somewhere (in the pump?) letting oil past, back to the reservoir?
Is there anything else it could be or any checks I should do?

Click to expand...

Is there a pressure regulator anywhere?

 

kermit_rr

Very

Full Member

• Jul 3, 2021

• #15

Grrrrrr said:

Is there a pressure regulator anywhere?

Click to expand...

There's a pressure switch