1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Are fb brake boosters interchangeable 12a/13b?

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Old 06-12-09, 12:25 AM
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Are fb brake boosters interchangeable 12a/13b?

The unit in my gsl-se is clearly bad and I'd like to swap in the booster from my 12a which is down for mods. The se is an 84, the gsl an 85. I couldn't locate the answer through searching. Thanks in advance!
Old 06-12-09, 02:39 AM
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i pretty sure theyre different cuz i picked one up from a gsl a few years ago to put on my gslse but it didnt work. the hole lineup is different
Old 06-12-09, 03:03 AM
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check mazdatrix.com it should tell you if they would interchange
Old 06-12-09, 01:30 PM
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foxed.ca has the parts catalog, section 4300... off the top it should work
Old 06-12-09, 02:29 PM
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The gs booster is smaller than the se. It should work but the pedal effort may be different. I went from a gs booster to the se and had to move the clutch master cyl. over but since your doing just the opposite it should be fine.
Old 06-12-09, 03:50 PM
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He stated he has a "GSL", not a "GS", but it does not matter as all 84-85 models are interchangeable.


Originally Posted by allbee
The gs booster is smaller than the se. It should work but the pedal effort may be different. I went from a gs booster to the se and had to move the clutch master cyl. over but since your doing just the opposite it should be fine.
Old 06-14-09, 01:32 AM
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Thanks for the assistance fellas!
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