Mr Whippy
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| posted on 6/10/08 at 07:46 AM |
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Funny brake pump thing
Miss Whippys little corsa diesel managed to loose or seemed to loose its brakes, fortunately she rammed the handbrake on as only she can  and never
hit anything. Since she works at the other side of town she called the AA came out and said that the alternator belt had snapped! Buffoon I thought
what the hell has that to do with brakes??! So I looked over the little bucket when she got back and it’s got a vacuum pump stuck on the end of the
alternator eh? So basically when the belt snapped the vacuum assist stopped working and she thought the brakes weren’t working anymore…
Why does a diesel need this? Its not a turbo engine or anything, just seems very odd.
?
[Edited on 6/10/08 by Mr Whippy]
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NigeEss
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| posted on 6/10/08 at 07:56 AM |
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Probably the standard set up across the diseasel range and is needed for the turbo versions so
used on NA too.
Time is an illusion. Lunchtime doubly so.................Douglas Adams.
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tonym
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| posted on 6/10/08 at 08:08 AM |
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Due to the fact that there is no throttle butterfly in a diesel there is no manifold vacuum on decceleration. It is standard practice for a vacuum
pump to be fitted to both turbo and naturally aspirated diesel engines.
HTH
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JAG
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| posted on 6/10/08 at 08:09 AM |
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A Diesel engine has no throttle butterfly and so won't make any vacuum - well perhaps a tiny amount but it would have to be a very restrictive
intake manifold design.
Hence a vaccuum pump has to be fitted on most diesel engined cars.
Throttling is controlled by injecting more or less fuel at each cycle.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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Peteff
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| posted on 6/10/08 at 08:19 AM |
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She still had brakes but no longer power assisted brakes. They would still stop her car but more pedal effort needed on her part, get her a thigh
master so she can build them up ready for next time and she can practise by rolling downhill with the engine off and braking.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Mr Whippy
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| posted on 6/10/08 at 08:28 AM |
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quote:
Originally posted by Peteff
get her a thigh master so she can build them up ready for next time
Yeah I explained to her after I looked that infact she still had brakes but had to press hard, think she just jumped to the conclusion that they just
weren’t working.
Really didn't know there was no butterfly on a diesel, have no time for them myself so I've never looked.
Cheers makes sense now 
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dave r
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| posted on 6/10/08 at 07:28 PM |
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slight thread hijack, but the vac pumps... can they be re-piped to make a small compressor ? if they can i may have an alternator change comming up
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