I am a brake job on my V40 on my rear brake.. I am accidently remove (disconnect the fluid line ) to make the job easy... brake fluid is every where..


I am install all 2 new rear brake now..

by the time I get done the fluide master is all empty..

Now here is my question when you pump the brake palde .. DO the engine need to be runing ????

without the engine runing the braked pump up and I feel the pressure..

but when I turn on the motor the braked go down to the floor..

this lead me to believe you must bleed the brake with the engine runing.

!!>. Here is what I have done top up the fluid and bleed the 2 front brake then I check the fluid master see if it low on fluid. (yes it is so I opend it up and top it up .. but my question do I suppost to opend up the master and fill it up don't this let more air back in..???

I spend all afternoon bleeding all 4 brakes... the one that I remove the line have all the air shooting out.. now every thing seem to be fine

What do I need to check to making sure the brake is safe for the lady to drive .. thank all your input.

http://www.griotsgarage.com/index.jsp

i made a spelling mistake it is griots garage

dan

the best way to bleed the brakes is from the calipers. you pump fluid back through the calipers and up to the master cylinder. ipd has a tool that works off of the pressure in your spare tire, and others use a hand pump and look like a garden sprayer. you may be able to make your own from a cheap plastic garden sprayer if you can put a fitting on the spray hose to fit the caliper bleed valve. look at "groits garage" they have a web site with a couple of different models and different prices. since i am cheap i have my wife pump the pedals while i bleed the calipers.

pump up pedal untill you have a hard pedal.

open the bleed valve on the caliper to release the pressure.

WITH THE PEDAL STILL ON THE FLOOR TIGHTEN THE BLEEDER AND REPEAT. DO NOT LET THE PEDAL OFF THE FLOOR UNTILL THE BLEED VALVE IS TIGHT OR IT WILL SUCK IM MORE AIR INTO THE CALIPER.

Repeat untill all of the bubbles stop coming out and do all four wheels. remember to top off the fluid level in the master cylinder if it gets to low then you will just put more air into teh system.


Dan

The brake pedal pumping method has a disadvantage compared to the pressure bleeders. When the brake pedal goes to the floor, the master cylinder piston goes into an area which is never used and can get messed up pushing past any crud in there. I stopped using this method when the low cost pressure bleeders came out. Much cheaper than a new master cylinder! That's my $0.02.