Hard braking killing the engine?

wjie20 · Post by **wjie20** » Sat Apr 19, 2014 9:01 am

Hey guys,

I have finally done a top overhaul, and I have changed the brake servo unit, I think (that was what my mechanic called it).

Now when I press the brake pedal or brake hard. The engine just turns off (dies). I suspect that it is the brake servo but can anyone else advice?

Thank you.

canada karl · Post by **canada karl** » Thu Apr 24, 2014 1:31 pm

maybe a vacuum leak at the brake servo is killing the engine?

wjie20 · Post by **wjie20** » Tue May 20, 2014 7:37 pm

Hmm, I will check on that. How do you identify the brake servo? I was told that the right hand drives have two units.

Thanks

wjie20 · Post by **wjie20** » Thu May 29, 2014 12:24 am

Hi Guys, I'm assuming that this black unit here is the brake servo? I was told that there are two? So where is the other one… Mine is a Right Hand Drive by the way.

Thanks

wjie20 · Post by **wjie20** » Sun Jun 08, 2014 1:03 am

Anyone?

JodyStevens · Post by **JodyStevens** » Sun Jun 08, 2014 5:39 am

No there's only one booster.

Mike W. · Post by **Mike W.** » Sun Jun 08, 2014 11:30 am

Never having seen a RHD with the hood up the best I can do is a image from Realoem. Punch in your year and month and see what it says and look for it.

wjie20 · Post by **wjie20** » Sun Jun 08, 2014 9:46 pm

JodyStevens wrote:No there's only one booster.

Thanks, funny how I was told by the Australians that there are two units.
Maybe it's not the same

Mike W. wrote:Never having seen a RHD with the hood up the best I can do is a image from Realoem. Punch in your year and month and see what it says and look for it.

Thanks Mike, I had my chassis number in it. For the image you have included, it says "no parts found matching your car".

The only few that matches my car are the brake master cylinder, expansion tank and this:

I was told that there are two, I looked under the hood, I only see one.

bizz · Post by **bizz** » Sun Jun 08, 2014 11:16 pm

Edit: Is that first pic your car? i've never seen that configuration - what model is it?

RHD cars all have two as far as i know. Here is a picture of my 528, the setup may differ slightly for injected models:

wjie20 · Post by **wjie20** » Mon Jun 09, 2014 8:13 am

Hi bizz,

Yes it is my car, it's a 1981 525 it is currently in Malaysia. But I am in Melbourne for studies.

Well, by looking at your photo I guess it is different for Australia which has two.

Btw, which part of Australia are you from?

JodyStevens · Post by **JodyStevens** » Mon Jun 09, 2014 8:13 am

Oh RHD, I can't help you there, but I don't see why there would be two :dunno:

wjie20 · Post by **wjie20** » Mon Jun 09, 2014 11:01 pm

JodyStevens wrote:Oh RHD, I can't help you there, but I don't see why there would be two :dunno:

Me neither. But there are two apparently for the Australians, though I wonder if the UK models have two...Thanks though

canada karl wrote:maybe a vacuum leak at the brake servo is killing the engine?

By the way, how do I check if it is the brake servo unit that is killing the engine...?

Pierre · Post by **Pierre** » Tue Jun 17, 2014 1:57 am

Disconnect the vacuum hose to it and plug it. If the symptoms go away, it's in the vacuum circuit to the brake booster. It could as simple as the one way valve. You can test it with a vacuum pump, or if you don't have one, you can use your lungs. You should be able to suck one way, and not the other. And I did not mean it in any way that the way it as intended: Testing the one-way valve,

Cheers.