Sterling
Scholar
- Total Posts : 1060
- Scores: 0
- Reward points: 663
- Joined: 2011/08/01 11:02:49
- Location: Flinders VIC Australia
- Status: offline
spongey brake pedal
so ive bled the front brakes 3 times now, theres definately no air in the front system.
now i haven't touched the rear system at all. could air have gotten into the rear lines from changing the front calipers?
-------------------------AND/OR---------------------
are there any dodgy ways of making brake pedals feel solid?
for example if your selling a car, or to slip it past roadworthy requirments?
cheers
|
fordsy
Aficionado
- Total Posts : 797
- Scores: 13
- Reward points: 3029
- Joined: 2011/08/01 11:02:49
- Location: Location : Location !
- Status: offline
RE: spongey brake pedal
2010/07/01 21:28:05
(permalink)
I don't think using the word "dodgy" in the same sentence as "brakes" is a very good idea. Brakes are what stops you from hitting a tree.
|
Sterling
Scholar
- Total Posts : 1060
- Scores: 0
- Reward points: 663
- Joined: 2011/08/01 11:02:49
- Location: Flinders VIC Australia
- Status: offline
RE: spongey brake pedal
2010/07/01 21:34:30
(permalink)
true that, but i have a feeling the inspector is only stressing the pedal feel because he happens to have a brand new master on his shelf.
says $400 im like freak THAT.
what about blocking off the booster? would that improve it at all?
|
JordyCharlieBoz
Enthusiast
- Total Posts : 254
- Scores: 0
- Reward points: 965
- Joined: 2011/08/01 11:02:49
- Location: Baranduda Victoria Australia
- Status: offline
RE: spongey brake pedal
2010/07/01 21:34:58
(permalink)
I agree with fordsy. Tho replace tree with "Sliding off a cliff" Which i almost did =| Not fun stopping with the bonnet hanging over a few meter drop. Oh I also almost ran into the ass end of a truck. YOU MUST HAVE GOOD BREAKS
|
fordsy
Aficionado
- Total Posts : 797
- Scores: 13
- Reward points: 3029
- Joined: 2011/08/01 11:02:49
- Location: Location : Location !
- Status: offline
RE: spongey brake pedal
2010/07/01 21:53:33
(permalink)
quote:
Originally posted by Sterling
what about blocking off the booster? would that improve it at all?
It'll make the pedal harder but will take the roady bloke about two seconds to figure out what you've done. Do it once, do it properly, especially if it's anything to do with the safety of you and those around you.
|
Sterling
Scholar
- Total Posts : 1060
- Scores: 0
- Reward points: 663
- Joined: 2011/08/01 11:02:49
- Location: Flinders VIC Australia
- Status: offline
RE: spongey brake pedal
2010/07/01 22:03:06
(permalink)
hmm guess its something i shouldnt f*ck with.
ill give bleeding the rear brakes a try, not likely to solve anything, but cant hurt.
what's a good price for a master?
or to get one reco'd?
|
Mk1 Lotus
Supporter
- Total Posts : 204
- Scores: 3
- Reward points: 2811
- Joined: 2011/08/01 11:02:49
- Location: Sydney Australia
- Status: offline
RE: spongey brake pedal
2010/07/01 22:06:07
(permalink)
You can isolate the problem by clamping the brake lines one at time till the pedal goes hard. So clamp the single rear line at the diff, it pedal fells better the problem is in the rears, need a bleed or adjustment or both.
If it's still low clamp the front left and feel the pedal again then the right. If it's still soft the problem is in the master cylinder.
|
Sterling
Scholar
- Total Posts : 1060
- Scores: 0
- Reward points: 663
- Joined: 2011/08/01 11:02:49
- Location: Flinders VIC Australia
- Status: offline
RE: spongey brake pedal
2010/07/01 22:16:06
(permalink)
quote:
Originally posted by Mk1 Lotus
You can isolate the problem by clamping the brake lines one at time till the pedal goes hard. So clamp the single rear line at the diff, it pedal fells better the problem is in the rears, need a bleed or adjustment or both.
If it's still low clamp the front left and feel the pedal again then the right. If it's still soft the problem is in the master cylinder.
thanks for that mate, should start me off on the right path!
|
JamesR
Aficionado
- Total Posts : 395
- Scores: 0
- Reward points: 1446
- Joined: 2011/08/01 11:02:49
- Location: Traralgon Vic Australia
- Status: offline
RE: spongey brake pedal
2010/07/01 22:27:19
(permalink)
when bleeding the brakes, start from the rear left then rear right, front left, front right.
gotta work from furthest from the m/c and work towards it.
i got my m/c rebuilt for about $200ish
|
Avon
Enthusiast
- Total Posts : 255
- Scores: 1
- Reward points: 2799
- Joined: 2011/08/01 11:02:49
- Location: Perth WA Australia
- Status: offline
RE: spongey brake pedal
2010/07/01 23:52:08
(permalink)
Does the pedal feel improved when you pump the pedal 2-3 times?
If so, its just air somewhere.
If you suspect M/C just hold the brake pedal down while car idling and if the pedal feels good initially but slowly sinks to the floor the fluid is bypassing the piston andyour M/C is likely pitted and needs replace / recon.
The above is not a definitive diagnosis but its easy to check both without getting the tools out.
|
joeyjonsey
Supporter
- Total Posts : 241
- Scores: 3
- Reward points: 5179
- Joined: 2011/08/01 11:02:49
- Location: Brisbane, Logan qld Australia
- Status: offline
RE: spongey brake pedal
2010/08/01 00:11:26
(permalink)
i thought you were supposed to work from the closest bleed off to the furtherest ?? it's been that long since i've done i'll have to check a manual b4 i do it again
|
Sterling
Scholar
- Total Posts : 1060
- Scores: 0
- Reward points: 663
- Joined: 2011/08/01 11:02:49
- Location: Flinders VIC Australia
- Status: offline
RE: spongey brake pedal
2010/08/01 07:10:34
(permalink)
hmm haven't tested holding the pressure yet, but it does get harder if u "pump it up"
|
US3100
Enthusiast
- Total Posts : 30
- Scores: 1
- Reward points: 921
- Joined: 2011/08/01 11:02:49
- Location: Sydney New South Wales Australia
- Status: offline
RE: spongey brake pedal
2010/08/01 08:08:19
(permalink)
You mentioned you changed the front calipers, What about the pads and the condition of the rotors ? Are they new or reconditioned ? If they were bedded in with the old calipers are the pads back in the same position ie Left-Inside/Left-Outside, If not due to wear grooves you may not have full contact between the pads and rotors giving a soft feel to the pedal. Have you tried driving the car ? does it stop ? Albeit poorly ?
US3100
|
blackvr
Enthusiast
- Total Posts : 26
- Scores: 1
- Reward points: 2261
- Joined: 2011/08/01 11:02:49
- Location: Adelaide SA Australia
- Status: offline
RE: spongey brake pedal
2010/08/01 11:24:12
(permalink)
quote:
Originally posted by joeyjonsey
i thought you were supposed to work from the closest bleed off to the furtherest ?? it's been that long since i've done i'll have to check a manual b4 i do it again
No... definitely furtherest first, closest last. Mike
|
ross
Enthusiast
- Total Posts : 14
- Scores: 0
- Reward points: 1361
- Joined: 2011/08/01 11:02:49
- Location: eagleheights qld Australia
- Status: offline
RE: spongey brake pedal
2010/08/01 12:05:42
(permalink)
gregorys manual says bleed front right front left rear left
|