PCE91V64x4

I put in a new master cylinder, bled all 4 wheels (driver rear, pass rear, pass front, driver front), and then the LSPV. The LSPV will not bleed, no fluid will flow out of it (but all 4 wheels bled just fine). The brakes are ok but not as firm as they should be when I test drove it.

Any ideas or just keep on bleeding them in order until it works? I did it twice so far.

Thanks,
Scott

thook

If the LSPV won't bleed, it's clogged. Probably at the bleeder valve itself. You'll need to take the bleeder out and clean it with some brake cleaner and a thin wire or pick. If that won't do it, you may need to disassemble the LSPV. Not hard to do. But, see if cleaning the bleeder works, first.

PCE91V64x4

ok, will do that. When I have changed the brake fluid in the past I have not had this problem (no fluid) but I have had trouble getting all the air out of the LSPV so maybe whatever blockage is in there has just gotten worse.

thook

Yeah, over time moisture can build up in there. Well, in the entire system, really. And, so rust and crud tends to deposit in the nooks and crannies of everything. Brake fluid is hydroscopic.

If you can get someone to help, have someone pump the brake while you watch the LSPV. Pull the rubber boot at the bottom back enough to see the little end of the valve. It should be moving out when the brake is applied and back up when released. If it isn't moving, the valve's not even working.

http://www.autoshop101.com/forms/brake08.pdf