Ok, I've been checking for vacuum leaks before and I've replaced all connections I could find without result. The only pipe connected to the brake servo is a 2cm tube made of plastic bent like a bow.
I found this on another forum:
"There are two black plastic pipes which come over the brake resevoir and join the back of the inlet assembly using short braid covered pipes. I have these were perished and I have replaced them. Things look OK, but it is early days yet. Note that one of these pipes has a small brass restrictor in it, so don't throw away!!."
I don't know which pipes this guy means, is there any documentation/pictures on the vacuum lines for the B18U engine?
440 -95 B18U Problems with cold start + bad idle
- billofdurham
- MVS Moderator
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- Joined: Thu Feb 02, 2006 3:31 pm
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I can't find a vacuum diagram for your car so, at this time, I can't help with this one.
Bill.
Bill.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
I haven't found any vacuum leaqks, even tried with carburator cleaner without any luck
. But,from inside the car I can hear a sucking sound first second when I push down the throttle. Can a bad inlet manifold gasket appear as a vacuum leak? Since I've noticed the engine stabilizes If I repeatadly push down the breakpedal?

- billofdurham
- MVS Moderator
- Posts: 6507
- Joined: Thu Feb 02, 2006 3:31 pm
- Year and Model: 855, 1995
- Location: Durham, England
- Been thanked: 3 times
I haven't been ignoring this, I have been doing some research.
A bad inlet manifold gasket, unless there was a large piece missing, shouldn't make a noise that you could hear in the car. However, there is a vacuum pipe from the intake manifold to the brake servo (booster) unit. As the engine stabilizes when you repeatedly press the brake pedal it is possible that you have a leak in that pipe or at one of its ends. Have you checked this one?
Bill.
A bad inlet manifold gasket, unless there was a large piece missing, shouldn't make a noise that you could hear in the car. However, there is a vacuum pipe from the intake manifold to the brake servo (booster) unit. As the engine stabilizes when you repeatedly press the brake pedal it is possible that you have a leak in that pipe or at one of its ends. Have you checked this one?
Bill.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
I was afraid you guys were leaving me alone with this problem=) I really appreciate your help.
I have tried to check this pipe actually, spraying some carburattor cleaner and I didn't notice anything. I'm thinking of replacing It but I can't see how I can detach It from the booster unit?
Bu If I understand It right the vacuum is created in the intake manifold and If the manifold gasket is bad I would have a vacuum leak, right? or am way of?
I have tried to check this pipe actually, spraying some carburattor cleaner and I didn't notice anything. I'm thinking of replacing It but I can't see how I can detach It from the booster unit?
Bu If I understand It right the vacuum is created in the intake manifold and If the manifold gasket is bad I would have a vacuum leak, right? or am way of?
- billofdurham
- MVS Moderator
- Posts: 6507
- Joined: Thu Feb 02, 2006 3:31 pm
- Year and Model: 855, 1995
- Location: Durham, England
- Been thanked: 3 times
As if we would.I was afraid you guys were leaving me alone with this problem

The vacuum pipe is attached to a non-return valve at the servo unit. The non-return valve just pulls out.
You are right about the vacuum being created in the intake manifold but I don't know if it would make a loud enough noise to be heard inside the car.
Have you sprayed the carb cleaner on the intake manifold gasket to check for a leak there?
Bill.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
I removed this brake vacuum pipe from it's connection on the manifold and put my finger over the connection. No improvement was observed
meaning the pipe is OK.
I guess I have no choice now exept for replacing my inlet manifold/exhaust gasket. As I read on other forums I'ts a pretty common failure on the B18U engines. I've decided to do the job myself and I will start as soon as I get the new gasket. Is there anything else I can replace at the same time?


I guess I have no choice now exept for replacing my inlet manifold/exhaust gasket. As I read on other forums I'ts a pretty common failure on the B18U engines. I've decided to do the job myself and I will start as soon as I get the new gasket. Is there anything else I can replace at the same time?

- billofdurham
- MVS Moderator
- Posts: 6507
- Joined: Thu Feb 02, 2006 3:31 pm
- Year and Model: 855, 1995
- Location: Durham, England
- Been thanked: 3 times
It is a common failure point. I can't think of anything else to replace but would advise you to give the bolts a good soaking with releasing oil as they will be rusted and extremely tight. If any snap you will need to remove the head and have them taken out at a machine shop.
WD40 is good but if you can get your hands on some PlusGas formula A it is the best.
Bill.
WD40 is good but if you can get your hands on some PlusGas formula A it is the best.
Bill.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
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