87-89 Brake MC Kit

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Andy82GT
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87-89 Brake MC Kit

Post by Andy82GT » Sat May 05, 2018 11:06 am

My front brakes are seizing up, already replaced both calipers. Already purchased a used Master Cylinder, but would rather rebuild than go through the trouble of install and it being bad also, but Raybestos MK1717 kit is nowhere to be found? Have any of you found this or suitable seal kit?
Assist most appreciated!
82 Mustang GT, 408W install in prog
83 Ranger, 302, T5
85 XR4TI, need to do AT>T5 swap! Arrgh!

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Mike McCreight
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Re: 87-89 Brake MC Kit

Post by Mike McCreight » Sat May 05, 2018 4:59 pm

It's not a hobby, it's an obsession!

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Re: 87-89 Brake MC Kit

Post by thesameguy » Sat May 05, 2018 9:37 pm

Are you sure is isn't the flexible hoses between body and caliper? They can swell closed internally preventing the piston from properly retracting.

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Mike McCreight
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Re: 87-89 Brake MC Kit

Post by Mike McCreight » Sun May 06, 2018 6:46 am

X2.
Typically happens on one side though.
On that MC kit, it says 85-89. I have no direct experience with it, the MC are different from mid-86 on.
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Andy82GT
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Re: 87-89 Brake MC Kit

Post by Andy82GT » Sun May 06, 2018 4:25 pm

Yep, early MC is different. Plenty of parts for those, go figure.
Got braided lines, wonder if those can collapse, and on both sides?
Gonna go ahead and pull MC and check it out...thanks for replies, will update.
82 Mustang GT, 408W install in prog
83 Ranger, 302, T5
85 XR4TI, need to do AT>T5 swap! Arrgh!

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Re: 87-89 Brake MC Kit

Post by thesameguy » Sun May 06, 2018 7:26 pm

Braided lines will prevent the rubber from ballooing out, but typically won't stop them from collapsing in. I do agree that it'd be unusual to see the same effect on both sides, but in that sense we're talking about a street-driven car that's getting routine maintenance. If the car sat for a while, anything is possible. Some history there would help for sure... because I don't ever think I've even heard of a master cylinder trapping pressure... that's just as weird. :)

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Re: 87-89 Brake MC Kit

Post by zxr250cc » Fri Jun 01, 2018 10:47 am

1986 XR4Ti Mineral Blue Metallic
1999 Taurus SE 24v DOHC Spruce Green
2004 SVT ZX5 Focus EAP Screaming Yellow

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