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1998 Gs300 - Soft Brake Pedal


jitc
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I have a problem that has occured over the last 3 months.

I found the brakes getting softer, on the first depress, but when I then removed foot pressure and re-applied, the brakes where hard (as normal). Although, when I need to do a emergency stop on the first depress, the car would stop very well, without locking, but still soft and spongy, compared to my LS400.

The crank pulley failed a few months ago, and on collection the garage (Nationwide, Aldershot) reported the driver rear brake calliper system may be the cause and required possible inspection.

On collection, the exhaust started to blow under the heat shield on the front middle section and the engine started to backfire with very sluggish drive power.

I was advised to replace from the front middle onwards backwards (front middle, middle, two silencers and chrome covers), which I did at great expense, two weeks later!

On replacement of the exhaust system, the backfire was still there and after several days of repair and replacement of the plugs, leads and coil for cylinder 1 & 5, it then needed further diagnoses and it was found that the fuel injector to cylinder 1 required replacement, again at great expense, especially in manpower.

During this I asked them to further inspect the brakes, so they bleeded the brake system. Their diagnosis was the whole brake master cylinder system requires replacement at a cost of over £2500! But no mention of the driver rear calliper.

Could I ask any experience members, how should I approach this repair?

I have read on this forum, that a sensor with the cylinder system could have failed but the only repair method is to replace the complete master system, but why can the sensor not just be replaced? Or could it be that the driver rear driver cylinder be the cause (e.g. does ceased brake piston heads etc, cause soft brakes)?

You help and advice would be greatly appreciated!

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I have a problem that has occured over the last 3 months.

I found the brakes getting softer, on the first depress, but when I then removed foot pressure and re-applied, the brakes where hard (as normal). Although, when I need to do a emergency stop on the first depress, the car would stop very well, without locking, but still soft and spongy, compared to my LS400.

The crank pulley failed a few months ago, and on collection the garage (Nationwide, Aldershot) reported the driver rear brake calliper system may be the cause and required possible inspection.

On collection, the exhaust started to blow under the heat shield on the front middle section and the engine started to backfire with very sluggish drive power.

I was advised to replace from the front middle onwards backwards (front middle, middle, two silencers and chrome covers), which I did at great expense, two weeks later!

On replacement of the exhaust system, the backfire was still there and after several days of repair and replacement of the plugs, leads and coil for cylinder 1 & 5, it then needed further diagnoses and it was found that the fuel injector to cylinder 1 required replacement, again at great expense, especially in manpower.

During this I asked them to further inspect the brakes, so they bleeded the brake system. Their diagnosis was the whole brake master cylinder system requires replacement at a cost of over £2500! But no mention of the driver rear calliper.

Could I ask any experience members, how should I approach this repair?

I have read on this forum, that a sensor with the cylinder system could have failed but the only repair method is to replace the complete master system, but why can the sensor not just be replaced? Or could it be that the driver rear driver cylinder be the cause (e.g. does ceased brake piston heads etc, cause soft brakes)?

You help and advice would be greatly appreciated!

This is quite a story! :) I can help as I'm very local to you and GS300 owner and other similar for years. Please send me Private Msg me urgently. I really think you need some guidance before you blow that wodge of cash mate.

Post back here if any probs with Priv Msg'ing (new?)

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