Vehicle is a '96 d1 300tdi abs.
Thanks for those suggestions. One mechanic said the same, the other thought it was discs reaching minimum thickness.
I will replace the vacuum servo unit and go from there:-)
I have not worked specifically on your model, but as I understand it the vacuum pump is mounted on the rear of the alternator. There will be some form of pipe or tube running from the pump to the booster. To be accurate you would need a pressure gauge that also reads vacuum. but a rough idea can be found by disconnecting the pipe, either from the pump, or where it enters the booster. Most systems pull around 15"Hg to 18"Hg, so just putting your finger over the open end of the pipe will give you some idea. The booster end will probably be both easier to get at, plus as it also includes the pipe, both are checked.
Be aware that the actual vacuum is not what boosts the brakes per se, but movement of the brake pedal allows atmospheric air pressure into the rear of the chamber that then pushes on a large diaphragm towards the vacuumed side, thereby assisting the master cylinder. If that part is not working correctly, or the diaphragm is leaking, then the brakes will be "heavy" to push all the time, and not as you have posted.
Naa, the vac pump is a stand alone unit driven off the camshaft on the RHS side of the block.
They are made by Wabco and are a pretty ordinary item, the cam follower and lever can break, O ring on the face plate leak, etc
The afternarket Bearmach ones used to be a more reliable pump.
To test the booster pump brakes engine off until all vacuum is expelled, hold foot on brake pedal and start engine, if the booster is working the pedal will sink under your foot a little, this is the vacuum assist working on the booster diaphragm.
No pressure gauge. The end of the hose sucks on my finger, weakly - hard to know what 15-18"Hg would feel like.
Yes I wouldn't describe it as heavy at all. The pump is the lead suspect at this point I reckon. According to glencoyne.co.uk they are a 300tdi "known weakness".Originally Posted by Old Farang
retrofit a 12V vac pump and close off the port on the mechanical one.
power via a relay and the ign wire on the injector pump. 20 minute job
For GM DC 12V Electric Vacuum Pump Power Brake Booster Auxiliary Pump Assembly | eBay
Dave
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