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General Category => General Discussion => Topic started by: jjwithers on March 24, 2026, 10:30:22 AM

Title: V50 Monza rear brake lost it's power
Post by: jjwithers on March 24, 2026, 10:30:22 AM

I have a 81 V50 Monza and the rear brake pedal now goes all the way down, and barely actuates the calipers. 

Is it safe to assume that a Master Cylinder rebuild is in order? 

I seem to remember looking into this years ago and there was a different solution.  The reservoir has brake fluid.  The lines are OK and not leaking.

TIA - Josh

Title: Re: V50 Monza rear brake lost it's power
Post by: Tkelly on March 24, 2026, 11:05:44 AM

Try bleeding it first,sounds like air in the line.

Title: Re: V50 Monza rear brake lost it's power
Post by: turboguzzi on March 24, 2026, 01:05:11 PM

does it still have linked brakes?

Title: Re: V50 Monza rear brake lost it's power
Post by: guzzisteve on March 24, 2026, 01:08:32 PM

Quote from: Tkelly on March 24, 2026, 11:05:44 AM

Try bleeding it first,sounds like air in the line.

This, a normal maintenance practice, should do every year plus a flush w/new fluid

Title: Re: V50 Monza rear brake lost it's power
Post by: paulbricey on March 25, 2026, 03:56:45 AM

Adding together the two posts above - If you bleed it AND it has linked brakes, you would be better to remove & raise both linked calipers as high as possible to the link pipe level on top frame tube & leave air bubbles to settle up overnight before bleeding BOTH calipers.