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Old 05-04-2020, 01:06 PM   #11
CarolinaHD
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Join Date: Aug 2017
Location: Cabarrus
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Re: Bosch Hydromax brake booster info

As you said, the earlier units like yours had a 1.75" bore and later on they switched to 2". They also had a 1.5" option for the 5000lb front axle according to rock auto.
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