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PV, 120 (Amazon), 1800 General Forum for the Volvo PV, 120 and 1800 cars |
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PV brake master cylinderViews : 2534 Replies : 21Users Viewing This Thread : |
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Nov 19th, 2018, 10:37 | #1 |
arcturus
Last Online: Yesterday 08:25
Join Date: Mar 2006
Location: Sagres Portugal
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PV brake master cylinder
How do I diagnose a failing master cylinder, what are the signs?
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Nov 19th, 2018, 14:43 | #2 |
Master Member
Last Online: Apr 18th, 2024 23:55
Join Date: May 2010
Location: wetherby
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Ok...having to pump the brake to get it to do anything....also look up at the pedals on the inside of the car, you may also see fluid on the bulkhead near the cylinder.. you may see fluid. You may also experience the pedal sinking to the floor
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Clive "Lets turn up the juice and see what shakes loose" Last edited by CLIVERALLY; Nov 19th, 2018 at 14:49. |
Nov 19th, 2018, 14:58 | #3 |
arcturus
Last Online: Yesterday 08:25
Join Date: Mar 2006
Location: Sagres Portugal
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I don't need to pump but I get a "sponginess" not a firm solid feel. Problem is that I know that PV drum brakes are not the best but I have no other PVs here to compare. Just fitted a new wheel brake cylinder and bled the brakes. Don't get a crisp "stop" Wondered if the master cylinder seals were worn or perhaps a worn cylinder
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Nov 19th, 2018, 16:18 | #4 |
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Last Online: Apr 18th, 2024 23:55
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If the brakes are spongy and you have bled them fully , non of the flexis bulge under full pedal pressure and car running..then without looking at it you could have a master cylinder issue..the pedal would in extreme circumstances sink to the floor. The danger here is that if you have a servo then this too can give you an insecure feel when applying the brakes...best and simplist trick for the servo is to pump the brake until it's hard and start the car...if the pedal does not move or it continues to travel to the floor after initial give then the servo is stuffed.
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Clive "Lets turn up the juice and see what shakes loose" |
Nov 19th, 2018, 16:18 | #5 |
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Last Online: Yesterday 13:10
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Was the pedal spongy before you changed the wheel cylinder? If not, you probably need to bleed some more.
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Nov 19th, 2018, 16:32 | #6 |
arcturus
Last Online: Yesterday 08:25
Join Date: Mar 2006
Location: Sagres Portugal
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Whenever I apply the brakes a little voice comes from behind the dash and says, "do you really want me to stop"
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Nov 19th, 2018, 17:45 | #7 |
marches on his stomach
Last Online: Feb 11th, 2022 03:15
Join Date: Jan 2018
Location: Somewhere in the Netherlands
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There's nothing much to go wrong with them - if you're having trouble bleeding try draining some fluid out and then use a pressure bleeder to push fluid back up through the system from each bleed nipple.
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