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Brake Bleeding - 87GT by avlonfrg
Started on: 12-05-2014 12:00 PM
Replies: 2 (243 views)
Last post by: theogre on 12-05-2014 04:06 PM
avlonfrg
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Report this Post12-05-2014 12:00 PM Click Here to See the Profile for avlonfrgClick Here to Email avlonfrgSend a Private Message to avlonfrgEdit/Delete MessageReply w/QuoteDirect Link to This Post
At 80 years of age, I no longer have the capacity (or will) to do all the necessary maintenance work. I had a really low brake pedal and often had to pump it to make it work. So I took it to a local repair shop. They put in a new master cylinder and new calipers on the rear. Brake pedal feel improved, but the shop said they think there may be an air bubble between the rear and the master cylinder. They described a high loop somewhere in the brake line which may be where the bubble is located. Can anyone here verify this? And if so, are there any tricks to remove the bubble?

John W
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jaskispyder
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Report this Post12-05-2014 12:15 PM Click Here to See the Profile for jaskispyderSend a Private Message to jaskispyderEdit/Delete MessageReply w/QuoteDirect Link to This Post
a new shop

Never had a problem bleeding brakes on the Fiero. The only high point is the rear right (and along trunk) and it shouldn't matter if they bleed it properly.

They should be able to pressure bleed the system to remove the air. Did they properly adjust the e-brake for the rear?

http://home.comcast.net/~fierocave/brakes.htm

[This message has been edited by jaskispyder (edited 12-05-2014).]

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theogre
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Report this Post12-05-2014 04:06 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post

Fiero brakes are fairly ease to bleed.
Bubble anywhere in line Will move in most bleeding methods. Brake fluid is thick enough to make sure.
Make sure the bleeder is really high point. If you bleed and car "axle" is not level then can tipped up the piston end and have trap air in the piston or bore. Most garages are level enough so should not be an issue. Is an issue for DIY working outside and uneven ground.

Possible problems:
  • May not bench bleed new MC... this covered in Bleeding MC notes
  • "New" caliper likely means rebuilt units. Very possible got bad rebuilt caliper(s) and piston won't self adjust.
    some info can explain rear piston... Rear Piston notes
  • Sometimes Bubble stuck in rear piston can be hard. Most times hitting w/ wood block etc that won't do damage to the parts can release the bubble.

    ------------------
    Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
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    The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

    [This message has been edited by theogre (edited 12-05-2014).]

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