Spongy brakes on my 1968 Jaguar 420G

[dgrahamenquiries100]

Dear All,

I hope you can help as I noticed when I drove my Jaguar 420G last Monday that the brake pedal travelled almost to the floor although the brakes did work. I checked the brake fluid reservoir which was not low and in any event if it was the igniition light would come on in the cabin. Also, about a year ago at last service the brake master cylinder was replaced when a similar issue occured. It was my first drive in about 6 weeks if that is of any significance.

Looking forward to your help and advice

Best wishes,

David

[piman]

Hello DG,

did the pedal response alter with time. ie. more applications of the brake brought the pedal higher?

Long pedal response could be air within the fluid, and this will respond to pumping the pedal, i.e. it will not need as long a travel as the initial application. Other and far less likely is what is known as pad knock back due to too much clearance of the wheel bearings.

Alec

[dgrahamenquiries100]

Hi Alec,

Thanks for your response.

I think its probably the former, (air in the system) although after driving about 30 miles it did not improve that much in terms of pedal travel so I'll get it checked out for any potential minor leak. I agree, I dont think its 'pad knock back' as it was perfectly fine the time before when I drove it.

Thanks

David