MetallicaMatt

iTrader: (19)

This is for the master cylinder on my GTO, but it uses a double inverted brake fitting

I have to pull the master tomorrow, I don't know if the thread needs chased or if it just has something in it


do they sell a tap for that? its just on the first couple of threads if that

1BadAction

iTrader: (10)

IF brake fittings use "standard" fine threads (1/4-28, 7/16-24, etc.), but you'll need a bottoming tap to get in there. Either that or a regular tap that has been ground down.

MetallicaMatt

iTrader: (19)

Does anybody know if that is the correct type of tap?

I don't know if this would be metric or not...?

MetallicaMatt

iTrader: (19)

I believe this would be metric since everything else on the car is

2004 GTO

1BadAction

iTrader: (10)

you need to get a pitch gauge and check it for yourself, or tear it apart and take one of the fittings to a real auto parts store- Ya know the kind that their first question isnt "what year, make and model"

are you sure its not a bubble flare? if it is then it'll be metric. heres a pic.

Beat98TJ

Bubble flare's are typically metric, while an inverted flare can be Metric or standard. Typical invert flare fitting sizes are 10mm x 1.0 and 3/8-24. If it is metric check the pitch as 1.25 and 1.5 appear at the most random times.

Also it could be larger than 10mm as master cylinder fittings more than others vary widely.

To tap all the way a custom ground tap will do the job, however I am curious as to why you want to tap it? There should be no issue's with the threads unless you have cross threaded them previously. Running a tap through them is a good way to get chips into your brake system unless you are extremely careful.

A bottoming tap will not tap deep enough on an IF. The lead in is too long.