How cani change the liquid of brakes sistem, please
The BEST way is to buy one of those pressure bleeders. Professional style bleeders start at $50, but you can get one that uses pressure from your spare tire to push fluid through the system for about $25. It will have detailed directions.
The kind of bleeder that uses a Mityvac to pull fluid through works, and is very safe for all brake systems, but does not work very well.
On a Volvo, the threaded part where the cap fits on the reservoir is fairly short. This means that you have to use two gaskets on the cap part of a pressure bleeder or it will leak fluid all over the floor. (Don't ask me how I know)
You should get a bottle and some clear nylon hose about 1/8" ID that fits the nipples on the brake calipers. That will keep the draining fluid contained so you don't make a mess and will allow you to see the color of the fluid and the bubbles (if any). I use two hoses so I can bleed two nipples at a time.
Your front calipers have two separate circuits feeding them, I believe, so be sure to bleed from ALL the nipples on the front calipers.
You can do this job without a bleeder by gently stroking the brake pedal while bleeding the calipers. Best to do both circuits simultaneously. This approach can be tricky and has some down-sides, but it is the most common approach used world-wide because it requires no special tools.
DO NOT let the reservoir run empty while doing this job! There are a couple of high spots in this system, and if you get air into a high spot, you will have to get a pressure bleeder to push it out.
Jun 25, 2011 |
1988 Volvo 240