Break servo

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peaky1979

peaky1979

Member
Posts
59
Hi
I have a rrs 2.7 tdv6 on a 2006. The break servo isn't holding the pressure as when I turn the engine off you can hear the air coming out. Now the part number is SJG 500045. Is AH22-2B195-BB the same anyone know.

Thanks Stephen
 
peaky1979 said:
Hi
I have a rrs 2.7 tdv6 on a 2006. The break servo isn't holding the pressure as when I turn the engine off you can hear the air coming out. Now the part number is SJG 500045. Is AH22-2B195-BB the same anyone know.

Thanks Stephen
Click to expand...
Anyone know before I buy it ?

Thanks
 
peaky1979 said:
Ok just didn't know if they updated them as there was a recall and they both look identical
Click to expand...
There could subtle differences that could bring your repair to a dead stand still and out of pocket. The amount of differences in parts for a multitude of vehicles even of the same manufacturer is ridiculous 😵
 
Last edited:
The Engineering reference (starting AH22 above) needs to be the same as the one you're taking off, it's permissible for the final letter to be further on in the alphabet and sometimes the penultimate letter, but the rest of the engineering reference needs to be exactly the same.
 
I'm not sure if its been replaced before as in my ownership the breaks have not been spot on even though I have put new discs and pads on and I have seen in another post that it effect,s the gear change and mine doesn't change down when you want it to.
 
Do you think it could just be the break master cylinder as there is oil on the vacuum hose where you clip them both together?
 
Have a look at the vacuum pipe from the brake booster to the vacuum pump, the section outside of the enclosure the brake booster is in should branch into two pipes. if it does not, then your vehicle has somehow missed a recall.

How did you diagnose where the vacuum leak is? it could be a perforated brake booster, seal between the booster & master cylinder, seal for the vacuum pipe or the seal around the actuator rod from the pedal.
 
Graculus said:
Have a look at the vacuum pipe from the brake booster to the vacuum pump, the section outside of the enclosure the brake booster is in should branch into two pipes. if it does not, then your vehicle has somehow missed a recall.

How did you diagnose where the vacuum leak is? it could be a perforated brake booster, seal between the booster & master cylinder, seal for the vacuum pipe or the seal around the actuator rod from the pedal.
Click to expand...
Hi
First off thanks for helping me. I haven't diagnosed nothing. It's just when I brake they work fine but take my foot off the brake and back on it goes solid then if I drive a little it goes back to normal. Yes it branches into 2 pipes.

Thanks
 
peaky1979 said:
Hi
First off thanks for helping me. I haven't diagnosed nothing. It's just when I brake they work fine but take my foot off the brake and back on it goes solid then if I drive a little it goes back to normal. Yes it branches into 2 pipes.

Thanks
Click to expand...
Before this happened if I kept foot on brake it would make a whoo noise 🤣
 
I'd suggest taking the vacuum pipe out of the brake booster and pushing a long cable tie into the bottom of the booster to check for oil ingress. Normally after that I'd do a smoke test to check for, and identify any leaks - you can use (low) pressure to check a vacuum system for leakage, it's much easier than trying to find where the air is getting in!.
 
Graculus said:
I'd suggest taking the vacuum pipe out of the brake booster and pushing a long cable tie into the bottom of the booster to check for oil ingress. Normally after that I'd do a smoke test to check for, and identify any leaks - you can use (low) pressure to check a vacuum system for leakage, it's much easier than trying to find where the air is getting in!.
Click to expand...
Thank you I will give that a try. What if there is oil in the booster ?
 
Graculus said:
Then there's an issue with the non return valves in the vacuum pump inlets
Click to expand...
I haven't checked yet but there was oil on the vacuum pipe when I unclipped them on top of the resiviour bit. So it could have nothing to do with the servo or master cylinder?
 
A mist coat of oil in the pipe is acceptable, if there is oil detected in the brake booster, then that needs changing, possibly also the master cylinder if the oil has breached the operating rod and also of course, the causal part.
 
Graculus said:
A mist coat of oil in the pipe is acceptable, if there is oil detected in the brake booster, then that needs changing, possibly also the master cylinder if the oil has breached the operating rod and also of course, the causal part.
Click to expand...
Thanks I will look tomorrow
 
Then you need to remove both pipes from the vacuum pump, if one has oil in and not the other, then you will probably just need the rework kit - I'll dig out the part number later. If both pipes have a roughly equal amount of oil in them, then you'll need to replace the VAC pump and seal along with the brake booster & possibly the brake master cylinder.
 
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