So here's the outcome from the mechanic today:
He put the car on the ramp and stripped down to the brakes. Couldn't see anything wrong with calipers or shoes, or ingress of dirt covering braking system, checked ABS sensor and visibly he said looks fine. He reckons its not the ABS sensor, he thinks its the ABS pump. He did also say he is not 100% not knowing exactly the problem. He put it on his diagnostic equipment which is £1,000 system and generic, therefore he suggested I should take the car to someone with a more detailed Lexus diagnostic system to double check and see if they can maybe confirm it is the ABS pump, even though there is no engine management light. He stresses he is not 100% sure, but suggests its the ABS Pump. What are your thoughts?
Secondly I inquired about a problem with the windscreen wipers. They go on and wipe perfectly. However the intermittent function does not work, only medium and fast speed. Also when you stop the wipers, they stop exactly on the windscreen, they do not go back down to settle. You have to use the manual control on the steering wheel to get it back down which takes a bit of precision. He said it needs a new motor. (The rear wiper does not work at all, or if when working, goes extremely slow, I never asked him to check that for me.)
Conclusion:
Please can anyone suggest or support with the following;
1. Suggest a Lexus specialist in Edinburgh or Glasgow? (I am based in Scotland, when I created my membership it came up with Gloucestershire instead of Glasgow)
2. Agree or disagree with ABS pump being a potential problem?
3. Suggestions on the front windscreen wipers - are the motors prone to failure?
4. The rear wiper, equally are the motors prone to failure?
Any help on the above would be highly appreciated.