Georgia Fiero Club Forum

All Things Fiero => Tech Tips, Tech Questions => Topic started by: GTRS Fiero on October 04, 2019, 06:42:45 pm

Title: Brake master cylinder
Post by: GTRS Fiero on October 04, 2019, 06:42:45 pm
Today, I received an email from TFS.  Among other things, the email contained an image of a brake master cylinder.

Some years ago, there was a discussion on PFF about a slanted MC, much like the one pictured in the TFS email.  I checked the TFS web site, and the site shows the same thing.  Having just done an article loosely about such things, I went back and referred to the pictures.  From the pictures, all brake master cylinders are flat.

Did I miss something?
Title: Re: Brake master cylinder
Post by: scottb on October 04, 2019, 07:08:49 pm
Maybe you have to tilt your screen. ....... or I misunderstood
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 04, 2019, 07:15:34 pm
See for yourself:
https://www.fierostore.com/Product/Detail.aspx?s=56054%20%20%20%20%208487

I don't usually install a master cylinder in my screen.
Title: Re: Brake master cylinder
Post by: scottb on October 04, 2019, 08:49:19 pm
 bad picture..... but it looks right to me. The master cylinder does mount with an upward angle but the cap is level. If you look at the master on the car you can see that the reservoirs are different depths.
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 04, 2019, 08:52:48 pm
So, the '88 is different?
Title: Re: Brake master cylinder
Post by: scottb on October 04, 2019, 08:54:28 pm
Havent looked at the 88 closely, but that is how my 86 is set up
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 04, 2019, 09:05:08 pm
On my '88, the front is deeper, and the back is wider.  The vertical connectors coming up to the tanks are different lengths.

See this thread:
http://www.fiero.nl/forum/Forum2/HTML/135266.html
Title: Re: Brake master cylinder
Post by: scottb on October 04, 2019, 09:26:24 pm
Will look at the 88 more closely tomorrow
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 04, 2019, 09:28:35 pm
My understanding is that the difference between the master cylinders, is the bore size.
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 06, 2019, 08:12:54 pm
Quote from: scottb on October 04, 2019, 09:26:24 pm
Will look at the 88 more closely tomorrow

Is it slanted, or as in the newsletter pics?
Title: Re: Brake master cylinder
Post by: scottb on October 06, 2019, 08:16:06 pm

86 SE master cylinder
Title: Re: Brake master cylinder
Post by: scottb on October 06, 2019, 08:17:26 pm


88 Formula Master cylinder..... they look awfully similar to me
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 06, 2019, 08:18:10 pm
It looks flat, to me.
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 06, 2019, 08:19:24 pm
Quote from: scottb on October 06, 2019, 08:17:26 pm


88 Formula Master cylinder..... they look awfully similar to me

They look identical, from the outside.  Only the bore is different.  Hence my observation on the TFS masfer cylinder.
Title: Re: Brake master cylinder
Post by: scottb on October 06, 2019, 08:21:45 pm
hard to say without getting out the laser level, but in person it looks like there is a slight up angle towards the front of the car
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 06, 2019, 08:24:38 pm
Easier than that.  Pull off the cover, and look at the fluid.  If the fluid is parallel to the top of the tank, there is no upward angle.
Title: Re: Brake master cylinder
Post by: Fierofool on October 06, 2019, 08:53:12 pm
You can visually compare buy looking at the reservoir cover and the casting line on the body of the master cylinder.  They seem to be parallel to one another on all units. 

I have seen some MC's that had the slanted reservoir.  It may have been used in vehicles that had a steeper slope hood, as in the vans. 
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 06, 2019, 08:54:13 pm
How about in a Fiero?
Title: Re: Brake master cylinder
Post by: Fierofool on October 06, 2019, 08:58:04 pm
I don't recall having seen a slanted one in a Fiero.
Title: Re: Brake master cylinder
Post by: GTRS Fiero on October 06, 2019, 09:00:46 pm
Therefore my confusion.