Many cars used a duel master cylinder system where there are 2 pistons in the master cylinder body. the systems are arranged so that there is brakes on 1 front wheel and a diagonal opposite rear wheel so if there is a loss of fluid from say a broken brake hose then only 1 set of wheels would be affected
If you look at the master cylinder you will see 2 pipes . These go down to a adaptor block and off to the relevent wheel sets.
SOURCE: 1997 villager. losing brake fluid but no visable
check all brake lines , and connections, may have to pull master forward to make sure its not leaking into booster from the back .good luck.
SOURCE: Brake Leak
I recently changed out one on my 97 villager. Not hard at all. I purchased a used unit from a junkyard. I agree a new ones cost is crazy. These units are known to have problems with high mileage villagers. But I am will to take a chance with a used one instead of paying our the but for a new one. I have had this used ABS unit on my villager for the past 4 months and no problems!!!! A used will vary in price, I only paid 50. bucks for mine.
Replacing it is not hard at all.
First find the ABS black box on the passenger side of engine. unscrew box, unscrew wiring harness and take out two relays.
Then begin unscrewing the lines, there are many lines, Some on top sides and bottom sides. Then you will see two bolts holding the whole unit on engine. Unscrew those and the unit will come right off.
First buy your used on from a junkyard, prefer still on vehicle. That way you can see if it might have been leaking or damaged with eyes view. I made sure the vehicle I took mine off of did not have old dried fluids or gunk around it.
Make sure the used unit is clean and do not get any dirt or dust inside the line holes. Make sure you have some plumbers tape on hand.
I always use plumbers tape when I mess with any screws. It fills any small fractions and helps prevent leakage.
Follow the same steps as taking out but backwards. Some of the lines are hard to get to, like the bottom side lines so before bolting the two screws down to hold unit in place I use the plumbers tape and do those first, then screw the hold nuts in place, the unit is secure. Then screw in rest of lines w/tape. I fill the fluid box again, because you will lose fluids after unhooking lines. Then test it. If everything is correct and you have no other ABS problems then your ABS light should not come on and everything is cool!
Good luck, and do the job yourself and save some big bucks!
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