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Engine Specific Info and Questions => Non VW Group Diesel => Topic started by: jtanguay on January 07, 2009, 08:38:45 pm

Title: audi 4000 brakes
Post by: jtanguay on January 07, 2009, 08:38:45 pm

so the 4 cyl version comes with vacuum brakes, and the 5 cyl comes with hydraulic, correct?

will the vw vacuum booster off say, a jetta, fit the 4000? its an '86

any help appreciated!

thanks

Title: audi 4000 brakes
Post by: jtanguay on January 08, 2009, 12:05:22 am

turns out my friends 4000 has the vacuum booster and its 5 cyl... looks like i'll be getting his car  8)

maybe the turbo version has hyd brakes???

Title: audi 4000 brakes
Post by: Turbinepowered on January 09, 2009, 09:31:16 pm

Quote from: "jtanguay"

turns out my friends 4000 has the vacuum booster and its 5 cyl... looks like i'll be getting his car  8)

maybe the turbo version has hyd brakes???

What do you mean by "hydraulic brakes" here? Pretty much every automotive braking system is either hydraulic or cable, and cable brakes went out a loooooooooooong time ago...  :?

Title: audi 4000 brakes
Post by: Ziptar on January 10, 2009, 04:46:06 am

He means Hydraulically Boosted Brakes, instead of a vacuum booster the brakes are boosted using hydraulic pressure from the power steering pump. They do exist, I had an Audi 200 Quattro and and a 1979 Chevy Diesel Pickup that had Hydro Brakes. The Audi design was horrible, the Chevy was actually excellent, worked really well.

http://www.benchworksteering.com/hydroboostbrakes.htm

If I remember right from my wrecking yard days, The 4000 Quattro and Quattro Coupe used the same Hydro Booster as the 5000 and the 4000 Non-Quattro coupes and sedans used the same vacuum booster as the VW Quantum for both the 4 and 5 cyl engines.

Title: audi 4000 brakes
Post by: jtanguay on January 22, 2009, 05:31:28 pm

yea the audi hyd boosted brakes SUCK! the accumulator only lasts about 150,000km.