Content

• Steps
• Method 1 of 3: Mechanical bleeding
• Method 2 of 3: Pumping with a vacuum pump
• Method 3 of 3: Pumping with a Hose
• What do you need

The slave cylinder is a component of manual transmission vehicles equipped with a hydraulic clutch. When the master or slave cylinder begins to leak, it must be replaced along with the brake fluid. When replacing parts, air bubbles enter the system, which leads to the fact that the clutch pedal becomes uninformative. To expel air bubbles, you need to bleed the slave cylinder. This article describes 3 ways to do this.

Steps

Method 1 of 3: Mechanical bleeding

1. 1 Jack up the front of the vehicle and secure it to the struts so that you have access to the throttle valve on the clutch cylinder.
2. 2 Have an assistant step on the clutch pedal, then press and hold it until you give the command.
3. 3 Climb under the car and look for the slave cylinder. If you cannot find it, it means that it can be located inside the gearbox, but the valve should go out. Look in the instruction manual or repair manual for the location of the slave cylinder.
4. 4 Unscrew the slave cylinder valve with a wrench and have a rag and container handy to catch the escaping brake fluid. Leave the valve open and watch to see if fluid flows out of the system. The escaping liquid will be discharged with the air.
5. 5 Tighten the valve after air bubbles, if any, have ceased to come out of the system.
6. 6 After the valve is closed, give the command to release the brake pedal. The pedal will remain depressed and must be manually lifted.
7. 7 Repeat the cycle: pressing the pedal, opening the valve and releasing the air, closing and raising the pedal until the pedal is springy as usual.
8. 8 Check the brake fluid level and top up if necessary.

Method 2 of 3: Pumping with a vacuum pump

1. 1 Buy a hand pump for priming from an auto parts store.
2. 2 Raise the vehicle to gain access to the clutch slave cylinder.
3. 3 Ask an assistant to press the clutch pedal.
4. 4 Unscrew the valve and connect the pump.
5. 5 Pump the brake fluid into a transparent container until the bubbles disappear.
6. 6 Close the valve.
7. 7 Raise the clutch pedal to draw up the brake fluid on the master cylinder. Try how the pedal works, if it is too soft, repeat the procedure.
8. 8 Check the brake fluid level and top up if necessary.

Method 3 of 3: Pumping with a Hose

1. 1 Buy a small plastic tube from an auto supply store or a fishing store.
2. 2 Raise the car.
3. 3 Insert one end of the tube firmly into the throttle valve and the other into a clear bottle of new brake fluid.
4. 4 The pumping process is as follows: ask the assistant to depress the clutch pedal, and unscrew the valve yourself. The air escaping through the tube will enter the brake fluid bottle.
   • Close the valve and ask the assistant to raise the clutch pedal.
   • Repeat the procedure until all air is purged from the system.
5. 5 Top up with brake fluid if necessary.

What do you need

• 2 Jacks
• Wrench
• Brake fluid
• Rags
• Method 2: manual vacuum pump
  • transparent container
• Method 3: a transparent hose with a cross section of 6 - 7 mm.
  • Small transparent bottle