Why is there air in brakes after changing discs and pads?

2010 VAUXHALL ASTRA
100,000 MILES
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TATZ2UK
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I changed the back brake pads and discs one day and everything was fine. Did the same method when changing the front brakes, the next day and a small amount of air got in the brake line. How can this happen when changing discs and pads?
Aug 5, 2022 at 1:22 AM
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STRAILER
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Yep, it does happen when the calipers start to age because it pulls through the seals, you could have had air in the ABS module which will make the brake spongy. Have you tried to bleed the system? If so, did it work? If not, you will need to connect a scanner to open the ABS valves.

Here is a guide and video to help you do the job:

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Please run down this guide and report back.
Aug 5, 2022 at 5:15 PM
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TATZ2UK
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Thanks very much. We did try to bleed the brakes but didn’t do it right after looking through the article. We were taking our foot off the brake when bleeding them which would have explained why they were still spongy. We’ll bleed them properly and that should do the trick.
Aug 6, 2022 at 1:51 AM
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STRAILER
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Use 2CarPros anytime, we are here to help. Please tell a friend.
Aug 6, 2022 at 7:45 PM