I've just put on new master cylinder,rotor,drums,brake cylinders(left and right) the brake pads and shoes are fine.I've bled the breaks until there were no more air bubbles coming out the tube I've attach to the bleeder screw nipple using a brake bleeding kit (I've bled all 4 ) but the brakes still feel spongy ,I don't see any signs of brake fluid leek and I cant figer it out,why is it still spongy. should I try bleeding the brakes with the car running or with it off or do it matter will the pressure still be the same.
but what i do notice after I bleed the brakes and it tight it seems and feel like it all go away and go back to being spongy like it lost the pressure it had, while I'm driving it.
2007-04-14 05:33:47 · 4 answers · asked by Byte_this 3 in Cars & Transportation ➔ Maintenance & Repairs
I was told by a mechanic that bench bleeding can be done two ways either place the MC (master cylinder ) in a vise and bleed it like that or install it back in the car (the quickest way ) and just keep pumping the brakes until on more air show repeat for all sides ( he said what i basically want to do with the MC is to get it full of brake fluid and then push the fluid thru the lines while at the same time removing the air ( maybe I'll try the holding the brake paddle down then tighting the bleed screw. i use to tighting the screw as my friend apply the brakes.)
2007-04-14 06:02:04 · update #1
You should have read the instructions with the master cylinder.
You should have "bench bled" the master cylinder BEFORE putting it on the car.
The only thing you can do at this point is do about 20 baby pumps on the pedal to allow the air to bubble up into the resevior.
Then open each bleeder one at a time and pump the pedal 6 full pumps to get the remaing air out of the brake lines.
Don't let the resevior run dry!!!!
2007-04-14 05:43:37 · answer #1 · answered by Mr. KnowItAll 7 · 1⤊ 1⤋
Did you bench bleed the Master Cylinder? And then start bleeding at the tire furthest from the Master Cylinder, working your way to the closest? If you don't it is possible for there to still be air in the lines, even a little in 1 line can cause the whole system to feel spongey.
Another thing is, the bleeding kit you used, I've not had much expirence with them, I still do brake bleeding as a 2 man job, maybe something was done wrong. If someone else has more insight on the kits and how well they work, listen to them, I've not had much expirence with the 1 person brake bleeding kits.
2007-04-14 05:41:53 · answer #2 · answered by Anonymous · 0⤊ 0⤋
Might of had to Bench Bleed the Master Cylinder before you installed it on the vehicle. I've always bled brakes with the car off.
2007-04-14 05:43:27 · answer #3 · answered by psychoholiday1976 3 · 0⤊ 0⤋
Brake boosters rarely go out. Did you bleed the master cylinder? I bet there is air in it. That is sometimes difficult.
2016-04-01 01:27:30 · answer #4 · answered by Anonymous · 0⤊ 0⤋