Vacuum Actuated Switch
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 BARKSDALE PRESSURE OR VACUUM ACTUATED SWITCH S1H A150SS  US $128.00
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 Brand New Barksdale Pressure or Vacuum Actuated Switch US $125.00
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 Barksdale Pressure or Vacuum Actuated Switch DPD2T H18 US $125.00
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 BARKSDALE DPD2T A80SS PRESSURE OR VACUUM ACTUATED SWITCH NEW US $25.00
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 NEW BARKSDALE CONTROLS PRESSURE OR VACUUM ACTUATED SWITCH 4 18PSI D2H H18 US $18.99
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Taking Care of your Mercedes-benz Brake System
The Mercedes master cylinder that is usually used for Mercedes vehicles are manufactured by Girling, ATE, and Bendix. These master cylinders utilized two or three-chamber reservoirs, a level sensor contact built into each chamber. In times when brake fluid level is low or when there is pressure differential between two brake circuits caused by loss of fluid in either circuit, a warning light is activated.
The series 190, 420, and 500 make use of floating type front disc brake calipers while the other Benz models especially those with parking brakes and are cable actuated in rear brake rotor calipers utilizes non-floating type. All Mercedes cars have brake pad wear indicators and differential pressure warning indicator. The 420 and 500 series have inner pads only while the Anti-Lock Brake System is offered as a standard feature on the 420SEL, 300 and 560 series and optional for the 190 series. For the diesel models a vacuum pump is incorporated to provide vacuum to the power brake unit.
Adjusting Pedal Height
The height of the pedal measured from pedal pad to pedal stop should be 150mm. To get the correct pedal height adjust the loosen lock nuts and turn stop light switch afterwards tighten lock nuts and pedal free play 5-15 mm.
Above the brake pedal is the stoplight switch, loosen lock nuts and adjust switch in such a way that the contact button extends 6-8mm and then afterwards tighten lock nuts.
Parking Brake
1. Before raising the vehicle it is best to remove only one lug bolt at each rear wheel.
2. Try to rotate wheel until lug bolt hole is positioned over parking brake adjuster at an angle of 45 degrees forward for diagonal swing axle and 90 degrees forward for diagonal swing axle with starting torque compensation. And remember that parking brake must be adjusted if the brake pedal can be depressed by more than 2 steps of 6 without any braking effect. Try not to try to alter screw on parking brake intermediate lever since these screws are for balancing cable lengths only.
3. using a screwdriver inserted through the lug bolt hole, hand turn the adjuster until rear wheel can no longer be turned, back off the adjuster until it can be turned without the dragging the wheel.
Checking the Brake Warning Light
1. On the dash is mounted a dual warning light, try to turn the ignition on. Normally you will see a light glowing once parking brake lever is pulled tone notch and goes off when brake lever is full released.
2. To test the circuit warning sensor, again turn on the ignition, release the parking brake and make sure that the light is off. Open the bleeder screw on one wheel and depress brake pedal and the light should light up.
3. Close the bleeder screw, refill the brake fluid and bleed system. Make sure also that light goes out after testing and if the light didn’t turn off then the differential pressure pin of the Mercedes brake master cylinder should be reset.
About the Author
Dwyane Thomas is a part time cook and full-time auto-enthusiast. This 31-year old Civil and Environmental graduate is a consultant at one of the engineering firms in Pennsylvania.
2000 Dodge Stratus Air Conditioning/Heater?
The vacuum actuated switch that turns from cold to hot does not work. I took it in to a dealer and they said it would cost $1300 to repair. There was a piece broke off in the housing and the whole housing had to be replaced. That's out. They opened the door for a/c but during the winter I have no heat. Does anyone know a fix for this switch or how I can manually move the flap from heat to cold or cold to heat?
unfortunately the whole housing has to be removed before any repairs can be made. which means that the refrigerant has to be reclaimed, the dash pulled, heater hoses disconnected and the housing air conditioning needs to be taken out of the vehicle.
60 - "Learning PLC in an Authentic Learning Environment" Institute of Technical Education, Singapore
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