A32 Brake Pump Status !!

weikee

500 RPM
Senior Member
Jul 16, 2006
924
15
1,518
Last time when i drove a turbo car, when the engine is on boost >0, It will have no vacuum. And brake will only function if the reserved vacuum is available. Lucky enough i don't need so much braking when it go on boost.

Thos still driving turbo car give it a try, when on boost try step on brake pedal few time :) and you enjoy the no braking until you release throttle.
 

weikee

500 RPM
Senior Member
Jul 16, 2006
924
15
1,518
Not sure what car you driving. Some big cc car have a reserved vacuum tank because when engine on boost it will have no vacuum supply to the brake.

So if you have a bigger vacuum reserved just use your left leg slowly apply brake and do it few round and you notice your brake getting harder and harder to apply.

BUT PLEASE DO THIS IN EMPTY AND STRAIGHT ROAD.
 

12savefuel

Known Member
Senior Member
Dec 10, 2008
195
75
1,528
Not sure what car you driving. Some big cc car have a reserved vacuum tank because when engine on boost it will have no vacuum supply to the brake.

So if you have a bigger vacuum reserved just use your left leg slowly apply brake and do it few round and you notice your brake getting harder and harder to apply.

BUT PLEASE DO THIS IN EMPTY AND STRAIGHT ROAD.
I don't drive turbo any more. Used to have a rotary. Will ask my friend to try it out on his Subaru. If like that on NA car also the same theory should work. Just load the car to 0 boost and do the same. Will try that out on my civic manual easy to load to 0 boost on fifth gear and load speed.
 

weikee

500 RPM
Senior Member
Jul 16, 2006
924
15
1,518
I don't drive turbo any more. Used to have a rotary. Will ask my friend to try it out on his Subaru. If like that on NA car also the same theory should work. Just load the car to 0 boost and do the same. Will try that out on my civic manual easy to load to 0 boost on fifth gear and load speed.
On NA not so easy, cause when full throttle you only got few sec to play around. Usually the brake vacuum reserved can be good for few "stepping"
 

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