Quote:
Originally Posted by Gerardfdz  I think the funda given is not all correct!The same hyd lines from the present master to the individual wheels can be connected to it. As "a booster is employed to reduce pedal effort by driver, "with the help of a vaccum! And not some Pump that will increase pressure in the lines!
That is the only part that needs to be replaced !
Nothing like that required! Just a hose from the Intake manifold to the booster diaphram!
PS My gypsy was modded with a booster brake -By Maruti! |
Very correct the booster reduces pedal effort, but exerts much more pressure than human foot to push brake fluid in lines & hoses.So increasing pressure in lines. Under this increament in brake fluid pressure the flexible hoses near wheels may give up, Remember brakes are critical component.
I dont know about vaccum from intake manifold being sufficent to boost(i may be wrong), but have practically seen a vehicle with a separate vaccum pump to store boosting diffrential pressure in vaccum tanks.
Master cylinder & servo combo simply multiplies the foot effort by hydraulic means(simple physics). now effort augmentation is achieved using a booster, means booster is pushing same fluid from master cylinder under much more pressure(foot effort+booster effort), so pressure inside brake pipes increases & hence chance of failure of hoses which were designed to handle lesser pressure(i.e. from foot effort augmented by master+servo combo).
I am not sure about smaller vehicles, but bigger vehicles do have a dedicated vaccum pump(or compressor) to feed booster & not brake fluid directly.
i hope this clears everything, there is a reservoir to hold vaccum/pressure which supplies the vaccum or compressed air to booster when pedal is actuated by driver.
You may be correct that smaller vehicles might use intake vaccum for boosting(as i am not aware of this thing), but what mechanism is there to tackle:
1. variation in intake vaccum due to variation in enigne rpm under different driving conditions?
2. in case of engine shut off, all boosting must go at once, where as it doesnt happens, you loose boosting only after 2-3 pedal depressions ?