I was told to get a master clinder booster when he herd air coming from my brake padel under the stering wheel. Now my cars emissions service message is being displayed as of now.My battery just died a minute reading f1 and f2 I been charging it up a few times before but i's the orginal 2000 issued volvo battery so i m thinking it could be that. HELP ME PLEASE WITH THE BEST OF YOUR KNOWLEDGE
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Vacuum booster is brake assist. when it goes out entirely it will be harder to push the brakes and stop. It could last a year or go out tomorrow. you will still have brakes , but it is harder to stop. Don't let anyone else drive it and give yourself plenty of room between you and the other car.
If it is doing this and the car doesn't want to stop no matter how hard you push on it, it is probably a bad master cylinder. The piston in the master cylinder can get worn, dirty, or rusted and not want to move anymore.
If the car still stops but takes a lot of force to make it stop, then I'd look at the brake booster between the master cylinder and the firewall. It could also be a bad vacuum going to the booster. Check the hose that goes to the booster from the motor.
There is no adjustment to the rod between the brake rod and the booster on a S80. If you are having brake light problems the first place to look is in the trunk for a bad fuse in the rear electrical module behind the cover on the left side.
I have never worked on a Volvo, but they are pretty much the same as everyone else since they are most likely using the same suppliers. The vacuum brake booster is mounted to the firewall on the driver's side and is usually attached by four bolts, and the brake master cylinder is attached to it by four bolts. Start by unbolting the master cylinder from the booster and gently bend the brake lines so the master cylinder is out of your way. Remove the rod that goes between the brake master cylinder and the brake booster and set it aside. Pull the vacuum line off the brake booster, and unbolt the brake booster. Put the replacement booster in place, bolt it back up, put the rod back in place between the booster and master cylinder, bolt the master cylinder back up to the booster, and reconnect the vacuum line. Take the old booster back to the parts shop to get your core charge, and you should be finished. It is usually not very difficult and should not take more than about an hour using normal hand tools. A DIY job should save you about $100-150 in labor costs, and the part will be much cheaper without the mark-up.
Then open the hood and remove the Upper torque mount cross member.
Next remove the Air filter housing.
The remove the Big Cover over the Relay/fuse panel under the hood. Once the cover is off remove the 13mm nut for the Positive cable. Then remove the 2 screws securing the Relay box into place.(one of the screws is under where the positive cable just came off)Unplug the one harness from the box and move the box to the side.
Then reach under and unplug the ABS module. There is 2 plugs. One you have to push a little tab and fold the cover back to release the plug. The other is 2 push tabs then pull. Ok here is where it will get a little tricky. Look where the ABS pump motor assembly bolts to the body. There is 3 10mm bolts remove them and make sure the pump motor is loose.(No need to disconnect the lines) Remove the 2 screws holding the Master Cylinder to the booster.Unplug the sensor in the booster. Remove the Line and Valve from inside the booster.
That should be about it from outside till the booster is loose. Inside the car:
Remove the Lower dash panel on the drivers side. Then remove the clip holding the brake pedal to the booster. Either slide the Pin out or slide the Arm off.(Forget which it has). Then remove the 4 13mm screws holding the Booster to the Firewall. Now go back outside:
Then slide the Master cylinder off of the Booster and kind of pull and move to the side. Might require Carefully bending some of the lines. Then slide the Booster out.(Most of the times it takes some work to get it slid out. It might take some time to slide it out just take your time. Then install in reverse order.
It will take a little time to do. About 1/2 a day at home with Hand tools.
Sorry forgot to tell you to make sure you check the adjustment on the brake light switch when you are done.
You have to check your master cylinder, pump your brake several times and hold it, see if is going down to the bottom, if does, the master cylinder is wrong, check the brake pressure hose, maybe you have some air in your brake lines, be sure you have enough brake fluid
there is a big rober hose by the power booster start the car up and then turn the car off then unplug the hose if you hear like air the the booster is ok but if not then most likelly the powwer booster is not good