Q: when bleed the abs unit on my |986 mersedes 300diesel it should come brake fuel out om the top of the unit

asked by on

ok I pump the brake whith the key on the hol the pedal dawn but no flued coming out of the bleeding screw on the top of the abs unit why .
My car has an automatic transmission.

ABS equipped vehicles have complex piston, cylinder, and valving arrangements. As a consequence, typically a bi-directional scan tool has to be used to expel air and/or bleed the system. Bi-directional tools remotely actuate the ABS system, using commands, to accomplish the bleeding. Inasmuch as your vehicle is 1986 vintage, there could be an alternate, "low tech" means to bleed the ABS system which is specified in the Factory Service Manual (FSM) and that a responding certified Mechanic would employ. ABS systems work under very high pressure and if you do not have the FSM, be careful experimenting with bleeding techniques as fluid could come out unexpectedly under high pressure. If you do not have the FSM and/or a scan tool, what I would suggest in your circumstances is a brake inspection which can be set up via YourMechanic’s website.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. when bleed the abs unit on my |986 mersedes 300diesel it should come brake fuel out om the top of the unit

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car pulls to the right after tire rotation

Hello. On your 2002 Mercedes Benz SLK320, all of the tires have to have the same tread design an the same amount of tread. Any variations will cause the computer to not read the sensors correctly which will cause these...

Q: cranks but wont start. 1986 Toyota Pickup

Try to spray some starting fluid into the throttle body to see if the vehicle starts and then stalls. If it does, then look at the fuel injection for potential issues such as a computer not firing the injectors. If...

Q: engine cooling fan keeps running after car is turn ed off. New fan installed. problem still happens. aslo coolant and temperatu

A fault with a fuse would more likely result in non operation rather than continuous operation. ECM's rarely go bad, indeed of the ones "claimed" to be bad, that is of those sent in as warranty returns, based on surveys...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...