For 07 Octavia, I had all four brake discs (feredo) and pads (brembo) changed earlier this week. Since then I have drove around 110 miles. I note that fuel consumption has increased. Before the change I was having around 44 mpg (motorway driving) and now around 39mpg. I contacted the workshop and they said that it is normal to have a temporary drop in mileage until the brake and discs are fully bedded and can take few days to do so.

Is this correct or should I be asking them to check the brakes now?

What they say is quite right.

2 hours ago, hifiboy said:

Is this correct

Yes; you may have to give it up to 1_000 miles depending on driving style.

Just a point which may be useful, I had the same issue, found it was sticking calipers, replaced, & no more high fuel consumption, to test park the car on a slight grade, release handbrake & see if it rolls. 

 

I have now done more than 100k. Three discs have been smooth and even but since last 3 to 4 days, I have noticed a groove being carved on right rear driver side disc. pictures below.

Is the caliper sometimes sticking?. I lifted the car up yesterday on the jack, wheel seems to be moving freely and also rollls on a slight grade.

Deffinnately new disc & pads

I meant the groove on the pics on new disc is  normal or due to a problem such as caliper sticking to the disc?

It'll be some foreign matter lodged on the pad e.g. stone/rust etc.

 

Not worth stripping to see, just keep an eye on it as it wears away.

3 hours ago, hifiboy said:

I have noticed a groove being carved on right rear driver side disc.

Any other symptoms? Squealing noises, tendency for this wheel to get hot...?

1 hour ago, pantherryda said:

1 minute ago, KenONeill said:

Any other symptoms? Squealing noises, tendency for this wheel to get hot...?

No noise.  Wheel is not hot but disc is hot. .difficult to say if this disc is more hot then the three others .  But Caliper a little hot on this wheel...

 

3 minutes ago, hifiboy said:

But Caliper a little hot on this wheel...

Ah, it may be binding on then.

Is it possible that binding can happen sometimes and other times is fine. , As when I lifted the car on jack, I was able to rotate the wheel fine?. What could be most likely causes?

2 hours ago, hifiboy said:

Is it possible that binding can happen sometimes and other times is fine. , As when I lifted the car on jack, I was able to rotate the wheel fine?. What could be most likely causes?

The wheel & caliper will be very hot to touch

 

2 hours ago, hifiboy said:

Is it possible that binding can happen sometimes and other times is fine. , As when I lifted the car on jack, I was able to rotate the wheel fine?. What could be most likely causes?

The wheel & caliper will be hot to ti

2 hours ago, hifiboy said:

Is it possible that binding can happen sometimes and other times is fine. , As when I lifted the car on jack, I was able to rotate the wheel fine?. What could be most likely causes?

2 hours ago, hifiboy said:

Is it possible that binding can happen sometimes and other times is fine. , As when I lifted the car on jack, I was able to rotate the wheel fine?. What could be most likely causes?

On 21/08/2021 at 21:39, Nexus21 said:

Hello there.

Yes this is an ongoing issue,4 original sensors and a rewire and still showing on vcds as faulty but the car does not overheat at all,always bang on 90 on the gauge.

 

Thank you very much.

 

I will look into your findings,If it solves the issue I will post up for people in the future who may need that help.

 

 

On 30/08/2021 at 19:53, hifiboy said:

Is it possible that binding can happen sometimes and other times is fine. , As when I lifted the car on jack, I was able to rotate the wheel fine?. What could be most likely causes?

 

Yes, generally when the binding starts to happen it will only do so when the calliper is hot. And it's like a positive feedback loop because once it starts binding it gets hotter, and then binds harder, causing it to get hotter, causing it to bind harder etc. Once it has cooled down it will generally release.

 

I had to replace both of my front callipers about a year apart, at around 130k-135k, due to binding. I started to notice the first one would start to stick when it was hot and it was obvious especially when doing a standing start on a slight uphill gradient as the car would not roll back as expected. I put it off for a few weeks as I was not driving much last year and then one night I was on an A road doing 70mph and I could smell smoke, pulled over in a layby and the calliper was literally red hot and smoking. I threw some water over it and gave it half an hour to cool down. Then drove home carefully and had it replaced the following day.

 

Same story with the nearside calliper about 10 months later, although this one escalated a lot more quickly, I had barely noticed it binding at all and then one evening after work not even on a long or high speed drive I came out of a 40mph section of road and once again could smell the brake pad burning. Pulled over again and jacked the car up, the calliper was binding so hard I couldn't even spin the wheel by hand. Even the tyre was hot from the heat! Got the AA out, fair play absolutely excellent service from the bloke he took the calliper apart made sure there was no debris etc in it, greased the sliders or something, brushed down the pad with a wire brush, put everything back together again and followed me as I drove home. Checked the temperature of both front brakes with an IR thermometer once I was home and they were both the same at around 40 degrees nice and cool. He said it would probably be fine now but I decided to get it replaced later that week just for peace of mind. Haven't had any problems since.

Edited 31 August, 20214 yr by slow_nick