• Replace Spring Brakes in 4 Easy Steps

    Before you begin the actual replacement procedure of your spring brakes, there are a few safety precautions that you need to take into consideration.  

    1. In the replacement and/or servicing of any spring brake chamber, ensure that the wheels of the vehicle are blocked. This will prevent a roll-away and possible bodily harm.
    2. Never attempt to service the spring brakes if you notice physical or structural damage. It is recommended that you replace the entire unit with a new one.
    3. To remove damaged spring brakes you must first cut the service push rod using a blow torch (acetylene). This will release any excess force that may have built up.
    4. Never strike the spring brake chamber for any reason. Doing so might cause damage to the mechanical structure. Take extra precaution in handling the spring brake chamber, as a fall will result in damage.
    5. The emergency diaphragm on the spring brake chamber Model ATTTPS cannot be replaced. You will have to replace the entire piggyback.
    6. When replacing spring brakes, never work from the front or back. Always position your body to the side.

    Spring brakes require maintenance just like any of your other drum and disc brakes on your vehicle. Over time, these brakes will become worn and replacing them will become necessary. Spring brakes are the parking brakes on vehicles, and use air brakes. The spring brakes on a vehicle are connected through the same lines that attach the chambers.

    Spring brakes are used for parking, but in the event of an emergency when the car experiences air pressure loss, they can stop a vehicle. Here’s how to replace your spring brakes.

    Tools and Materials Needed:

    • Screwdriver
    • Caging wrench
    • Wheel blocks

    Step 1: Access the Caging Bolt

    The spring brake will have a piece of metal that runs through both it and the service brake chambers, called the caging bolt. In order to compress the spring, the caging bolt must be turned. This is mandatory, as the spring is under extremely high pressure and dis-assembly cannot be performed without first compressing the spring.

    Caging the spring may also need to be done when the vehicle has lost air pressure.

    Step 2: Block the Wheels

    Position blocks under the wheels of the car. Caging the spring may also need to be done when the vehicle has lost air pressure.

    Step 3: Cage the Bolt

    Look at the parking brake chamber body. You should find specific instructions on how to cage the bolt for your system. It is extremely important to follow these directions carefully. The spring brakes are loaded with pressure, which could seriously injure you. Once you have compressed the spring by caging the bolt, you can disassemble the chamber and replace the old spring.

    Step 4: Dis-Assembly

    If you are not a qualified technician, you should not perform the dis-assembly of the brake chamber. Spring brakes are loaded with thousands of pounds of pressure which, if released unintentionally, can be deadly. You should stop the repair at caging the bolt if you are unqualified. This should only be performed by a certified air brake technician.