Good Sam Club Open Roads Forum: Tech Issues: Intermittent brake failure
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 > Intermittent brake failure

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ernie1

Sacramento,California,USA

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Joined: 02/10/2004

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Posted: 12/25/21 11:42am Link  |  Quote  |  Print  |  Notify Moderator

If my life depended on it, which it does, I would change the brake fluid AND the master cylinder and take a long hard look at all the hoses or just go ahead and change those also. Why wait for the situation to appear every so often try to diagnose a life threatening problem?

Geraldo de La Cruz

zihuatanejo

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Posted: 12/25/21 01:51pm Link  |  Quote  |  Print  |  Notify Moderator

Thank you for all your thoughts. The brake problem is so random. It only happens once every few years. Nothing obvious like brake fade. I think I will start by changing the brake fluid and then work my way towards the master cylinder.

Skibane

San Antonio, TX

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Posted: 12/25/21 11:50pm Link  |  Quote  |  Print  |  Notify Moderator

Brake pedal feels "spongy", goes all the way to the floor without much braking effect = Brake fluid is leaking past at least one cylinder, has air in it, or is boiling

Brake pedal feels firm, but requires MUCH more effort to get any braking effect = Power brake booster has an internal vacuum leak, or is no longer getting sufficient vacuum from the engine (or from the vacuum pump, if present)

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