Kamilo77

Finally get my missing stud in, all the new brake parts on all 4 corners. I throw the brake fluid in and notice that the brake fluid reservoir is cracked at the bottom nipple part. I can't find used on anywhere online and a new one is hundreds of dollars.

Anyone had experience with JB Weld and brake fluid? What's my options to fix the crack, it's looks like it's higher up almost at the bottom of the reservoir.

GlenL

Couldn't believe it and had to check. $360 for a brake fluid reservoir?! 928 Intl has used ones for $100. None on fleabay.

I'd be reluctant to put JB Weld or anything in the brake system. It's sensitive to contamination and debris. Is the crack leaking? Maybe dig around for a used one.

Mrmerlin

well since your this far a used resevoir will work,
928 INTL is your best source ..

Please NOTE if your master cylinder is all corroded with peeling black paint,
then it would be wise to remove the MC part and buy a new master cylinder,
use DC111 on the grommets to prevent water ingress and corroded inlet bores.

odds are good that if the old one has corroded inlets ,
then the grommets will leak after you fit a new reservoir ,
thus requiring MC removal. fitting new grommets isnt a cure for a corroded bore ,
DC 111 will prevent water from damaging the bores.

If you have a crack on the reservoir then chances are good you used a too much force prying with a screw driver.

NOTE its easier to remove a reservoir if you spray some WD40 onto the inlet ports first then tilt the reservoir a few time then pull up

NOTE if this is a 5 speed it would also be wise to replace the blue/black feed port hose for the clutch then you can also remove the booster to facilitate this

Kamilo77

I was going with the angle then pull approach and when it finally came loose that nipple cracked on the MC.

Might try the plastic weld approach, finalizing the details on my first home, so 100 bucks can go elsewhere at the moment.

dr bob

The ATE master cylinder castings have been used in more than a few different Euro cars over the 928 years. Think VW, BMW, MB, Volvo, Saab. Long before trying any half-fast attempts at welding or epoxy, I'd be looking at reservoirs for some of those other cars. Penalty for failure of the reservoir is no brakes, something that will be way hard to justify if you know in advance what the risks are and run into something or someone anyway. Critical dimension on the reservoir will be center-to-center on the bottom ports. If you have a manual transmission, you'll want the aux hose nipple for the clutch hose too.

soontobered84

Are there any differences between model years brake reservoirs?

I might have a used reservoir I could send.

cali4sun

I had to replace mine about 6 months ago and bought a used reservoir from 928intl.

Good to go!


'89 928 S4 GP White/Black

The Forgotten On

All 928s used the same reservoir so that should help broaden your search.

Kamilo77

Plastic welding/melting went well. No leaks around the nipple and nice and rigid. Gona give this a shot before I go for used. Thank you for the offer!

Kamilo77

The plastic welding failed under pressure. Soontobered84 was generous enough to offer a used reservoir and now after a booster, MC, SS hoses, rotors, and pads I finally have brakes! The brake feel is not quite touchy like modern systems but I can lock up the wheels which is perfect.

Mrmerlin

thats great you have brakes,
now you need new tires if the old ones are more than 5 years old