TB removal and then some!!!

[Jagdpanzer]

Anyway you can get some compressed air behind it? If so be sure to have bunched up rag over the exit to catch it.

[Roadster]

Originally Posted by Jagdpanzer

Anyway you can get some compressed air behind it? If so be sure to have bunched up rag over the exit to catch it.

Thanks Phil....will try tomorrow....I don't know if the air will be below the piston enough to force it out....as I have to go through the bias piston opening or try the ports on the side....I may end up going with a new unit....been looking around to see what is out there.....

[Jagdpanzer]

Have you tried pounding the exit end down by hand on a block of wood?


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[Roadster]

Originally Posted by Jagdpanzer

Have you tried pounding the exit end down by hand on a block of wood?


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Yes....but I will try that again also....

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[Roadster]

Decided to try the Dorman MC unit from Auto Zone...20% off the $136 cost plus free overnight shipping....so for a total of $116 which included 6% sales tax...not bad....
The AutoZone site specifies that you call an 800 # (which is a 3rd party tech support) and give them your VIN # to insure getting the correct MC....which is part# NM3027
Speaking with the tech guy...the part is either made in Mexico or Singapore and will be listed on the box....my thought is maybe just switch the internals or all of the rubber seals to my original...if I can get that piston out....or just use the new unit and have the original as a rebuilt spare....
Also had a review on their site from another 94 ZR-1 owner from 2018 who gave it a 5☆ rating and said it worked perfect....we shall see...20210415_125728.jpg

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[JG95ZR1]

Internals are not identical I tried but master cylinder works fine. I even installed the DRM bias spring in it


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[Roadster]

Originally Posted by JG95ZR1

Internals are not identical I tried but master cylinder works fine. I even installed the DRM bias spring in it


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Thanks for the info....looks like this may be the way to go....

[Roadster]

Just received overnight delivery of the Dorman MC....looks good...even supplied with a brake bleeder kit for the MC....will install the DRM bias spring....
Pics #1& 2...looks like a well made unit...
Pic #3...includes bleeder kit...
Pic #4...I imagine a casting # on the bottom...
Pic #5... made in Taiwan...
Pic #6...again assuming casting # on bottom of original unit...similar...but not the same...20210416_162209.jpg20210416_162246.jpg20210416_162256.jpg20210416_162341.jpg20210416_162314.jpg20210416_162701.jpg

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[Roadster]

Between reorganizing my work stations in the basement the last few days...finished up the DRM bias MC spring tonight...another task completed....
Pic #1...that is the new Dorman MC in the pic..along the original bias spring piston at the top...that spring was a little crusty...the second spring is the Dorman spring...which is slightly smaller than the original spring still in the bore above...the bias spring at the bottom is the DRM spring which is much smaller overall...and the Dorman setup is different from the original setup in that there is no small spring at the top of the piston as shown in the pic...if you look at the replacement spring...you see a small white plastic piece...there is a spring that is incorporated there and that piece fits into the top of the bias spring... altogether a different approach... plus I would imagine that the two small springs probably serve a different purpose for each piston bore....
Pic #2...the top bias piston is the original and the bottom is from the Dorman....although the same size and mostly the same configuration with the "o" ring gaskets...there are some differences in the size and location of the fluid holes in the pistons themselves....
Pic #3...is when the job is completed and then you find the exact tool you needed for the job... still in the tool box... had to use what I had at the time (in this pic) and needed to plastic tie the attachments to this snap ring tool...to keep it from moving allover the place...20210423_193245.jpg20210423_165110.jpg20210423_205820.jpg

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[Roadster]

Few more items completed this afternoon...original coolant pipe is repaired and repainted....will be going back in service....
Pic #1....just drying on the bench...
Pics #2 & #3...one of the very few times I have ever used JB Weld for a repair...let it cure overnight and then I did sand down after these pics were taken...
Pics #4 & #5...spent some time cleaning the RS front caliper the best that I could...ready for paint...
Pic #6...painted and drying out on the vise dryer....2 down...2 more to go....20210425_133925.jpg20210425_120223.jpg20210425_120231.jpg20210425_132440.jpg20210425_132453.jpg20210425_133605.jpg

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