Hard brake pedal
Discussion
I've only noticed over the past few weeks ..... And to be honest I've not noticed it before, so I don't know if it's a problem or not.
Anyway .....
On my E39 auto touring, I always press the brake pedal before I start the car. For some reason, over the past few weeks I've noticed that the pedal is rock hard and won't move. As soon as the car starts, it then depresses as normal.
When I first noticed this I did some brake tests in a local [empty] car park and the brakes were fine, and have been ever since. When the car has been left for a few hours and driven again the pedal is soft. But when left overnight it's hard.
Can anyone advise if there's a problem? It might just be my imagination - but I don't recall it being hard before Christmas.
Many thanks in advance,
K
Anyway .....
On my E39 auto touring, I always press the brake pedal before I start the car. For some reason, over the past few weeks I've noticed that the pedal is rock hard and won't move. As soon as the car starts, it then depresses as normal.
When I first noticed this I did some brake tests in a local [empty] car park and the brakes were fine, and have been ever since. When the car has been left for a few hours and driven again the pedal is soft. But when left overnight it's hard.
Can anyone advise if there's a problem? It might just be my imagination - but I don't recall it being hard before Christmas.
Many thanks in advance,
K
Kinky said:
I've only noticed over the past few weeks ..... And to be honest I've not noticed it before, so I don't know if it's a problem or not.
Anyway .....
On my E39 auto touring, I always press the brake pedal before I start the car. For some reason, over the past few weeks I've noticed that the pedal is rock hard and won't move. As soon as the car starts, it then depresses as normal.
When I first noticed this I did some brake tests in a local [empty] car park and the brakes were fine, and have been ever since. When the car has been left for a few hours and driven again the pedal is soft. But when left overnight it's hard.
Can anyone advise if there's a problem? It might just be my imagination - but I don't recall it being hard before Christmas.
Many thanks in advance,
K
Anyway .....
On my E39 auto touring, I always press the brake pedal before I start the car. For some reason, over the past few weeks I've noticed that the pedal is rock hard and won't move. As soon as the car starts, it then depresses as normal.
When I first noticed this I did some brake tests in a local [empty] car park and the brakes were fine, and have been ever since. When the car has been left for a few hours and driven again the pedal is soft. But when left overnight it's hard.
Can anyone advise if there's a problem? It might just be my imagination - but I don't recall it being hard before Christmas.
Many thanks in advance,
K
Mine's exactly the same as this (E39 528i), and always has been. An inspection 2 and MOT didn't change a thing; braking response is just as crisp and precise as ever it was.
Worry not, say I.
Thats a normal brake pedal action.
The pedal however should take 2-3 pumps before it goes rock hard.This takes the vacuum out of the servo.
When you start up the engine the vacuum is re applied and the pedal returns to normal.
If you have a hard pedal without any pumping then it suggests a small air leak between the inlet manifold and the servo(petrol),or the vacuum pump and servo(deisels).
The pedal however should take 2-3 pumps before it goes rock hard.This takes the vacuum out of the servo.
When you start up the engine the vacuum is re applied and the pedal returns to normal.
If you have a hard pedal without any pumping then it suggests a small air leak between the inlet manifold and the servo(petrol),or the vacuum pump and servo(deisels).
blackspider said:
Thats a normal brake pedal action.
The pedal however should take 2-3 pumps before it goes rock hard.This takes the vacuum out of the servo.
When you start up the engine the vacuum is re applied and the pedal returns to normal.
If you have a hard pedal without any pumping then it suggests a small air leak between the inlet manifold and the servo(petrol),or the vacuum pump and servo(deisels).
The pedal however should take 2-3 pumps before it goes rock hard.This takes the vacuum out of the servo.
When you start up the engine the vacuum is re applied and the pedal returns to normal.
If you have a hard pedal without any pumping then it suggests a small air leak between the inlet manifold and the servo(petrol),or the vacuum pump and servo(deisels).
Checked mine this morning, as I finally remembered about this thread.
It does indeed go rock solid after a few firm pumps.
And the brake pedal, too.
blackspider said:
Thats a normal brake pedal action.
The pedal however should take 2-3 pumps before it goes rock hard.This takes the vacuum out of the servo.
When you start up the engine the vacuum is re applied and the pedal returns to normal.
If you have a hard pedal without any pumping then it suggests a small air leak between the inlet manifold and the servo(petrol),or the vacuum pump and servo(deisels).
The pedal however should take 2-3 pumps before it goes rock hard.This takes the vacuum out of the servo.
When you start up the engine the vacuum is re applied and the pedal returns to normal.
If you have a hard pedal without any pumping then it suggests a small air leak between the inlet manifold and the servo(petrol),or the vacuum pump and servo(deisels).
exactly right - don't worry
Was just about to post a thread about this topic, but found this one!... Recently bought a 55 plate 320d auto and after being stood overnight or at work all day the brake pedal is solid! Surely a BM this age shouldn't have an air leak.
Edited by sgtvr on Friday 19th January 22:01
Edited by sgtvr on Friday 19th January 22:03
[quote=sgtvr]Was just about to post a thread about this topic, but found this one!... Recently bought a 55 plate 320d auto and after being stood overnight or at work all day the brake pedal is solid! Surely a BM this age shouldn't have an air leak.
The late ones do go solid after standing-This really dosent matter as you arent likely to be using the brake pedal whilst parked with the engine off.When you have your foot on the pedal before you start the engine its solid-as long as when you start the engine the pedal sinks to its normal operating point then thats good.
The late ones do go solid after standing-This really dosent matter as you arent likely to be using the brake pedal whilst parked with the engine off.When you have your foot on the pedal before you start the engine its solid-as long as when you start the engine the pedal sinks to its normal operating point then thats good.
sgtvr said:
Ok thanks Blackspider!Do you work for BMW dealer?
You obviously know your BM's,you are on most threads!!!
Cheers
You obviously know your BM's,you are on most threads!!!
Cheers
Edited by sgtvr on Saturday 20th January 01:32
BMW Master Tech,with much to much spare time on my hands-as soon as it stops raining and winding i'll be back out there with my TVR.
An old wedge series 1 280 fhc-number 9 off the line.Brilliant little car.
I used to work for a Trevor dealer-1997-2001,best part of my career that was.Absolutely loved working with the Cerbs,Griffs and Chims and of course the road tests.
Its really sad whats happening with the marque at the moment.God knows where its going.Is it all over...who knows!
I used to work for a Trevor dealer-1997-2001,best part of my career that was.Absolutely loved working with the Cerbs,Griffs and Chims and of course the road tests.
Its really sad whats happening with the marque at the moment.God knows where its going.Is it all over...who knows!
Cerb 4.5 the best TVR. Awesome! Not driven one any distance other than length of factory but just the quick revs,noise and feel of em!Great! Yours is definately classic though.
Whats the story with these run flat tyres mate? They dont inspire confidence when driving at speed do they?No choice though....got no spare!
Whats the story with these run flat tyres mate? They dont inspire confidence when driving at speed do they?No choice though....got no spare!
The 4.5 lightwieght was my dream machine-incredible speed and its great to know your the one driving-so any mistakes your the one on the rescue mission not the car.Took one round Castle coombe a few years ago-amazing-but get this,I sat in as a passenger in the S12...Change of underwear for me!!!
The runflats do have a tendancy to tram line,very hard drive aswell.I dont like them and the feedback isnt great from customers either.
You can go over to normal tyres when youres have worn out without any problem.But the obvious technical hitch is there is nowhere to put a spare or space saver.
The only other solution I think would be to carry the Mobilty kit which comes with M3's or Cooper S's.
The runflats do have a tendancy to tram line,very hard drive aswell.I dont like them and the feedback isnt great from customers either.
You can go over to normal tyres when youres have worn out without any problem.But the obvious technical hitch is there is nowhere to put a spare or space saver.
The only other solution I think would be to carry the Mobilty kit which comes with M3's or Cooper S's.
The 4.5 lightwieght was my dream machine-awesome power and its great to be in control of that kind of power.Took one around Castle coombe a few years ago-absolutely brilliant.I also,get this,sat in as passenger in the S12...NOW THATS AWESOME!!!!!!!!!!!
But my next car has to be a Sagaris..Its a perfect looking monster...
The Runflats do tend to tram line and give a hard drive..I dont like them and the feedback from customers isnt good either.
You can swop over to normal tyres when yours are worn out without any problem,but the downside is there is nowhere to put a spare wheel or space saver.You could however carry a Mobility kit as fitted to M power and Cooper S's which does work well.
But my next car has to be a Sagaris..Its a perfect looking monster...
The Runflats do tend to tram line and give a hard drive..I dont like them and the feedback from customers isnt good either.
You can swop over to normal tyres when yours are worn out without any problem,but the downside is there is nowhere to put a spare wheel or space saver.You could however carry a Mobility kit as fitted to M power and Cooper S's which does work well.
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