Had a leaky master cylinder. Bought replacement from Atlantic British. Installation was easy, so I started to bleed the brakes. Front passenger side and rear drivers side will not bleed at all! Others seemed to bleed just fine. What now? I've gone from having leaky brakes to basically no brakes. Read something about needing to cycle the modulator. Sound like what I need? If so, I need instructions. Especially any that don't involve a $650 diagnostic tool.

 

Have you tried cycling the key on and off. Turn the truck on then off again. The abs should do a system check. Most vehicles do. Also do you have an abs amigo so you can clear any codes that will develop when you cycle the key. Third, have you checked the bleeders themselves?

 

I replaced my 03 master cyl without a problem and never had to turn on the car when pumping on the pedal or insert a key.

Are you not getting any fluid out the line with the bleed valve cracked?

 

I tried cycling the key, checked the bleeder valves along with several others things. I finally pulled the brake lines at the calipers and I only get a dribble of fluid at the RF & LR the other two bleed fine. From what I've read I believe the abs modulator has air in it. I'm taking it to the dealer monday. I hate being defeated

 

Did you "bench bleed" your new master cylinder before installing it?

 

The master cylinder cannot be replaced with being filled and bled using the testbook. Ask Disco Mike on this one.... 100% sure.

 

Problem solved ,only cost me an arm & leg from the knee down. The new master cylinder was defective. Shop couldn't get it to bleed either, tested it, it failed. Replaced it and she's working again. Thanks to everyone for your help BIG thanks to Mike for his pms & time. Hopefully this won't happen to anyone else but if it does maybe this will help.