Brake lag after starting

trstjohn · Post by **trstjohn** » 13 Apr 2011, 06:53

Do I also need a check valve?

trstjohn · Post by **trstjohn** » 15 Apr 2011, 06:43

Anyone know where I can get a check valve other than the dealer? I've called all of the MVS suggested parts dealers and they didn't have anything.

Post by **jimmy57** » 15 Apr 2011, 07:30

Turn off engine and do no touch brake pedal. Let vehicle sit for 4 hours. Now get in and depress brake pedal and check to see if it depresses with normal effort. If it is hard to depress ON THE FIRST PUSH then you need check valve.
Has the vehicle been doing fine since the fuse was replaced?

trstjohn · Post by **trstjohn** » 15 Apr 2011, 10:45

The fuse has fixed the hard brake on cold start, but what bothers me is the loud vibration sound that it makes during and after I shut off the vehicle.

I did what you suggested and it depressed about 1/3 of the way with normal effort. I had to give more effort to go the rest of the way.

Post by **jimmy57** » 15 Apr 2011, 10:59

As i posted earlier, I think your problem is the switch fir vacuum pump sticking and the pump runs too long or continuously at times. The pumps have a good service history and failures are rarely seen unless the switch sticks and pumps runs far longer than designed for and overheats.
You shouldn't hear pump run after engine warms up unless you push and release brake 2 0r more times rapidly.

trstjohn · Post by **trstjohn** » 20 Apr 2011, 06:48

Jimmy-
I was having trouble removing the switch from existing vacuum pump. Do I need to remove the hose before I remove the switch from the old pump? I havent ordered a new switch yet, so I don't want to break the existing switch by being too forceful when prying it off.

volvodoc · Post by **volvodoc** » 20 Apr 2011, 07:54

replace the entire line the switch is included and not serviced seperatly

trstjohn · Post by **trstjohn** » 20 Apr 2011, 18:33

I can't seem to find a part number for the switch. I called ErieVoVo and they didn't have it. Anyone have the part number?

adamkpl · Post by **adamkpl** » 31 Jan 2013, 04:13

Sorry to resurrect but just curious what the fix was?

trstjohn · Post by **trstjohn** » 27 Apr 2013, 15:29

It was the check valve. I got ride of the vehicle shortly after due to numerous other problems

Brake lag after starting

Re: Brake lag after starting